45609981 has 4 divisors (see below), whose sum is σ = 60813312. Its totient is φ = 30406652.

The previous prime is 45609979. The next prime is 45610001. The reversal of 45609981 is 18990654.

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.

It is a cyclic number.

It is not a de Polignac number, because 45609981 - 2¹ = 45609979 is a prime.

It is a super-2 number, since 2×45609981² = 4160540733640722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45609961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7601661 + ... + 7601666.

It is an arithmetic number, because the mean of its divisors is an integer number (15203328).

Almost surely, 2^45609981 is an apocalyptic number.

It is an amenable number.

45609981 is a deficient number, since it is larger than the sum of its proper divisors (15203331).

45609981 is a wasteful number, since it uses less digits than its factorization.

45609981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15203330.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 45609981 is about 6753.5161952867. The cubic root of 45609981 is about 357.2892617510.

It can be divided in two parts, 4560 and 9981, that added together give a palindrome (14541).

The spelling of 45609981 in words is "forty-five million, six hundred nine thousand, nine hundred eighty-one".