23690521 has 2 divisors, whose sum is σ = 23690522. Its totient is φ = 23690520.

The previous prime is 23690519. The next prime is 23690543. The reversal of 23690521 is 12509632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20575296 + 3115225 = 4536^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 23690521 - 2¹ = 23690519 is a prime.

It is a super-2 number, since 2×23690521² = 1122481570502882, which contains 22 as substring.

Together with 23690519, it forms a pair of twin primes.

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

It is a self number, because there is not a number n which added to its sum of digits gives 23690521.

It is not a weakly prime, because it can be changed into another prime (23690581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11845260 + 11845261.

It is an arithmetic number, because the mean of its divisors is an integer number (11845261).

Almost surely, 2^23690521 is an apocalyptic number.

It is an amenable number.

23690521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23690521 is an equidigital number, since it uses as much as digits as its factorization.

23690521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 23690521 is about 4867.2909302814. The cubic root of 23690521 is about 287.2046964068.

The spelling of 23690521 in words is "twenty-three million, six hundred ninety thousand, five hundred twenty-one".