23551531 has 2 divisors, whose sum is σ = 23551532. Its totient is φ = 23551530.

The previous prime is 23551529. The next prime is 23551601. The reversal of 23551531 is 13515532.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23551531 - 2¹ = 23551529 is a prime.

It is a super-2 number, since 2×23551531² = 1109349224887922, which contains 22 as substring.

Together with 23551529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 23551496 and 23551505.

It is not a weakly prime, because it can be changed into another prime (23551501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11775765 + 11775766.

It is an arithmetic number, because the mean of its divisors is an integer number (11775766).

Almost surely, 2^23551531 is an apocalyptic number.

23551531 is a deficient number, since it is larger than the sum of its proper divisors (1).

23551531 is an equidigital number, since it uses as much as digits as its factorization.

23551531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 25.

The square root of 23551531 is about 4852.9919637271. The cubic root of 23551531 is about 286.6419269858.

The spelling of 23551531 in words is "twenty-three million, five hundred fifty-one thousand, five hundred thirty-one".