45616981 has 4 divisors (see below), whose sum is σ = 47600352. Its totient is φ = 43633612.

The previous prime is 45616979. The next prime is 45616993. The reversal of 45616981 is 18961654.

45616981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18961654 = 2 ⋅9480827.

It is a cyclic number.

It is not a de Polignac number, because 45616981 - 2¹ = 45616979 is a prime.

It is a super-2 number, since 2×45616981² = 4161817911108722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45611981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 991651 + ... + 991696.

It is an arithmetic number, because the mean of its divisors is an integer number (11900088).

Almost surely, 2^45616981 is an apocalyptic number.

It is an amenable number.

45616981 is a deficient number, since it is larger than the sum of its proper divisors (1983371).

45616981 is a wasteful number, since it uses less digits than its factorization.

45616981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983370.

The product of its digits is 51840, while the sum is 40.

The square root of 45616981 is about 6754.0344239573. The cubic root of 45616981 is about 357.3075391604.

The spelling of 45616981 in words is "forty-five million, six hundred sixteen thousand, nine hundred eighty-one".