44645561 has 4 divisors (see below), whose sum is σ = 44804724. Its totient is φ = 44486400.

The previous prime is 44645551. The next prime is 44645563. The reversal of 44645561 is 16554644.

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 18318400 + 26327161 = 4280^2 + 5131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44645561 is a prime.

It is a super-2 number, since 2×44645561² = 3986452234009442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44645563) 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, 79160 + ... + 79721.

It is an arithmetic number, because the mean of its divisors is an integer number (11201181).

Almost surely, 2^44645561 is an apocalyptic number.

It is an amenable number.

44645561 is a deficient number, since it is larger than the sum of its proper divisors (159163).

44645561 is a wasteful number, since it uses less digits than its factorization.

44645561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159162.

The product of its digits is 57600, while the sum is 35.

The square root of 44645561 is about 6681.7333828880. The cubic root of 44645561 is about 354.7530147411.

The spelling of 44645561 in words is "forty-four million, six hundred forty-five thousand, five hundred sixty-one".