45656921 has 2 divisors, whose sum is σ = 45656922. Its totient is φ = 45656920.

The previous prime is 45656899. The next prime is 45656953. The reversal of 45656921 is 12965654.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45630025 + 26896 = 6755^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 45656921 - 2⁶ = 45656857 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (45656971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22828460 + 22828461.

It is an arithmetic number, because the mean of its divisors is an integer number (22828461).

Almost surely, 2^45656921 is an apocalyptic number.

It is an amenable number.

45656921 is a deficient number, since it is larger than the sum of its proper divisors (1).

45656921 is an equidigital number, since it uses as much as digits as its factorization.

45656921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The square root of 45656921 is about 6756.9905283343. The cubic root of 45656921 is about 357.4117890828.

The spelling of 45656921 in words is "forty-five million, six hundred fifty-six thousand, nine hundred twenty-one".