45619781 has 4 divisors (see below), whose sum is σ = 46071564. Its totient is φ = 45168000.

The previous prime is 45619753. The next prime is 45619811. The reversal of 45619781 is 18791654.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31248100 + 14371681 = 5590^2 + 3791^2 .

It is a cyclic number.

It is not a de Polignac number, because 45619781 - 2²² = 41425477 is a prime.

It is a super-2 number, since 2×45619781² = 4162328836975922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45619711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225740 + ... + 225941.

It is an arithmetic number, because the mean of its divisors is an integer number (11517891).

Almost surely, 2^45619781 is an apocalyptic number.

It is an amenable number.

45619781 is a deficient number, since it is larger than the sum of its proper divisors (451783).

45619781 is a wasteful number, since it uses less digits than its factorization.

45619781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451782.

The product of its digits is 60480, while the sum is 41.

The square root of 45619781 is about 6754.2417042922. The cubic root of 45619781 is about 357.3148496007.

The spelling of 45619781 in words is "forty-five million, six hundred nineteen thousand, seven hundred eighty-one".