45721691 has 2 divisors, whose sum is σ = 45721692. Its totient is φ = 45721690.

The previous prime is 45721681. The next prime is 45721727. The reversal of 45721691 is 19612754.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45721691 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (45721681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22860845 + 22860846.

It is an arithmetic number, because the mean of its divisors is an integer number (22860846).

Almost surely, 2^45721691 is an apocalyptic number.

45721691 is a deficient number, since it is larger than the sum of its proper divisors (1).

45721691 is an equidigital number, since it uses as much as digits as its factorization.

45721691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 45721691 is about 6761.7816439160. The cubic root of 45721691 is about 357.5807201952.

The spelling of 45721691 in words is "forty-five million, seven hundred twenty-one thousand, six hundred ninety-one".