23491921 has 2 divisors, whose sum is σ = 23491922. Its totient is φ = 23491920.

The previous prime is 23491907. The next prime is 23491939. The reversal of 23491921 is 12919432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22137025 + 1354896 = 4705^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 23491921 - 2⁹ = 23491409 is a prime.

It is not a weakly prime, because it can be changed into another prime (23491021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11745960 + 11745961.

It is an arithmetic number, because the mean of its divisors is an integer number (11745961).

Almost surely, 2^23491921 is an apocalyptic number.

It is an amenable number.

23491921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23491921 is an equidigital number, since it uses as much as digits as its factorization.

23491921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 23491921 is about 4846.8465005610. The cubic root of 23491921 is about 286.3998880665.

The spelling of 23491921 in words is "twenty-three million, four hundred ninety-one thousand, nine hundred twenty-one".