23513551 has 2 divisors, whose sum is σ = 23513552. Its totient is φ = 23513550.

The previous prime is 23513549. The next prime is 23513563. The reversal of 23513551 is 15531532.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23513551 - 2¹ = 23513549 is a prime.

Together with 23513549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23513591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11756775 + 11756776.

It is an arithmetic number, because the mean of its divisors is an integer number (11756776).

Almost surely, 2^23513551 is an apocalyptic number.

23513551 is a deficient number, since it is larger than the sum of its proper divisors (1).

23513551 is an equidigital number, since it uses as much as digits as its factorization.

23513551 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 23513551 is about 4849.0773349164. The cubic root of 23513551 is about 286.4877612446.

The spelling of 23513551 in words is "twenty-three million, five hundred thirteen thousand, five hundred fifty-one".