23816521 has 2 divisors, whose sum is σ = 23816522. Its totient is φ = 23816520.

The previous prime is 23816509. The next prime is 23816537. The reversal of 23816521 is 12561832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16088121 + 7728400 = 4011^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 23816521 - 2¹¹ = 23814473 is a prime.

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 23816521.

It is not a weakly prime, because it can be changed into another prime (23816501) 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, 11908260 + 11908261.

It is an arithmetic number, because the mean of its divisors is an integer number (11908261).

Almost surely, 2^23816521 is an apocalyptic number.

It is an amenable number.

23816521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23816521 is an equidigital number, since it uses as much as digits as its factorization.

23816521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 23816521 is about 4880.2173107353. The cubic root of 23816521 is about 287.7129703661.

It can be divided in two parts, 2381652 and 1, that added together give a triangular number (2381653 = T₂₁₈₂).

The spelling of 23816521 in words is "twenty-three million, eight hundred sixteen thousand, five hundred twenty-one".