23503721 has 2 divisors, whose sum is σ = 23503722. Its totient is φ = 23503720.

The previous prime is 23503709. The next prime is 23503789. The reversal of 23503721 is 12730532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22090000 + 1413721 = 4700^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 23503721 - 2⁶ = 23503657 is a prime.

It is not a weakly prime, because it can be changed into another prime (23503321) 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, 11751860 + 11751861.

It is an arithmetic number, because the mean of its divisors is an integer number (11751861).

Almost surely, 2^23503721 is an apocalyptic number.

It is an amenable number.

23503721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23503721 is an equidigital number, since it uses as much as digits as its factorization.

23503721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 23503721 is about 4848.0636340708. The cubic root of 23503721 is about 286.4478329606.

The spelling of 23503721 in words is "twenty-three million, five hundred three thousand, seven hundred twenty-one".