45021561 has 16 divisors (see below), whose sum is σ = 64982400. Its totient is φ = 27561600.

The previous prime is 45021551. The next prime is 45021569. The reversal of 45021561 is 16512054.

It is not a de Polignac number, because 45021561 - 2⁶ = 45021497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45021569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4861 + ... + 10661.

It is an arithmetic number, because the mean of its divisors is an integer number (4061400).

Almost surely, 2^45021561 is an apocalyptic number.

It is an amenable number.

45021561 is a deficient number, since it is larger than the sum of its proper divisors (19960839).

45021561 is a wasteful number, since it uses less digits than its factorization.

45021561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 45021561 is about 6709.8108021017. The cubic root of 45021561 is about 355.7461289168.

The spelling of 45021561 in words is "forty-five million, twenty-one thousand, five hundred sixty-one".