23321657 has 2 divisors, whose sum is σ = 23321658. Its totient is φ = 23321656.

The previous prime is 23321653. The next prime is 23321659. The reversal of 23321657 is 75612332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15808576 + 7513081 = 3976^2 + 2741^2 .

It is a cyclic number.

It is not a de Polignac number, because 23321657 - 2² = 23321653 is a prime.

Together with 23321659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23321653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11660828 + 11660829.

It is an arithmetic number, because the mean of its divisors is an integer number (11660829).

Almost surely, 2^23321657 is an apocalyptic number.

It is an amenable number.

23321657 is a deficient number, since it is larger than the sum of its proper divisors (1).

23321657 is an equidigital number, since it uses as much as digits as its factorization.

23321657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 29.

The square root of 23321657 is about 4829.2501488326. The cubic root of 23321657 is about 285.7062896691.

Adding to 23321657 its reverse (75612332), we get a palindrome (98933989).

The spelling of 23321657 in words is "twenty-three million, three hundred twenty-one thousand, six hundred fifty-seven".