23521651 has 2 divisors, whose sum is σ = 23521652. Its totient is φ = 23521650.

The previous prime is 23521649. The next prime is 23521657. The reversal of 23521651 is 15612532.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23521651 - 2¹ = 23521649 is a prime.

Together with 23521649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23521657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11760825 + 11760826.

It is an arithmetic number, because the mean of its divisors is an integer number (11760826).

Almost surely, 2^23521651 is an apocalyptic number.

23521651 is a deficient number, since it is larger than the sum of its proper divisors (1).

23521651 is an equidigital number, since it uses as much as digits as its factorization.

23521651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 23521651 is about 4849.9124734370. The cubic root of 23521651 is about 286.5206541135.

The spelling of 23521651 in words is "twenty-three million, five hundred twenty-one thousand, six hundred fifty-one".