45221561 has 24 divisors (see below), whose sum is σ = 58506624. Its totient is φ = 34550880.

The previous prime is 45221549. The next prime is 45221563. The reversal of 45221561 is 16512254.

It is not a de Polignac number, because 45221561 - 2¹⁸ = 44959417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45221561.

It is not an unprimeable number, because it can be changed into a prime (45221563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27776 + ... + 29358.

It is an arithmetic number, because the mean of its divisors is an integer number (2437776).

Almost surely, 2^45221561 is an apocalyptic number.

It is an amenable number.

45221561 is a deficient number, since it is larger than the sum of its proper divisors (13285063).

45221561 is a wasteful number, since it uses less digits than its factorization.

45221561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661 (or 1654 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 45221561 is about 6724.6978370779. The cubic root of 45221561 is about 356.2721297015.

The spelling of 45221561 in words is "forty-five million, two hundred twenty-one thousand, five hundred sixty-one".