923232721 has 2 divisors, whose sum is σ = 923232722. Its totient is φ = 923232720.

The previous prime is 923232707. The next prime is 923232727. The reversal of 923232721 is 127232329.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 910530625 + 12702096 = 30175^2 + 3564^2 .

It is a cyclic number.

It is not a de Polignac number, because 923232721 - 2⁷ = 923232593 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (923232727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 461616360 + 461616361.

It is an arithmetic number, because the mean of its divisors is an integer number (461616361).

Almost surely, 2^923232721 is an apocalyptic number.

It is an amenable number.

923232721 is a deficient number, since it is larger than the sum of its proper divisors (1).

923232721 is an equidigital number, since it uses as much as digits as its factorization.

923232721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 923232721 is about 30384.7448730444. The cubic root of 923232721 is about 973.7266642179.

The spelling of 923232721 in words is "nine hundred twenty-three million, two hundred thirty-two thousand, seven hundred twenty-one".