23699521 has 2 divisors, whose sum is σ = 23699522. Its totient is φ = 23699520.

The previous prime is 23699509. The next prime is 23699527. The reversal of 23699521 is 12599632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20930625 + 2768896 = 4575^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 23699521 - 2⁷ = 23699393 is a prime.

It is not a weakly prime, because it can be changed into another prime (23699527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11849760 + 11849761.

It is an arithmetic number, because the mean of its divisors is an integer number (11849761).

Almost surely, 2^23699521 is an apocalyptic number.

It is an amenable number.

23699521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23699521 is an equidigital number, since it uses as much as digits as its factorization.

23699521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 37.

The square root of 23699521 is about 4868.2153814309. The cubic root of 23699521 is about 287.2410613733.

It can be divided in two parts, 236995 and 21, that added together give a triangular number (237016 = T₆₈₈).

The spelling of 23699521 in words is "twenty-three million, six hundred ninety-nine thousand, five hundred twenty-one".