23517979 has 2 divisors, whose sum is σ = 23517980. Its totient is φ = 23517978.

The previous prime is 23517973. The next prime is 23517997. The reversal of 23517979 is 97971532.

Together with next prime (23517997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23517979 - 2⁹ = 23517467 is a prime.

It is not a weakly prime, because it can be changed into another prime (23517973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11758989 + 11758990.

It is an arithmetic number, because the mean of its divisors is an integer number (11758990).

Almost surely, 2^23517979 is an apocalyptic number.

23517979 is a deficient number, since it is larger than the sum of its proper divisors (1).

23517979 is an equidigital number, since it uses as much as digits as its factorization.

23517979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 119070, while the sum is 43.

The square root of 23517979 is about 4849.5338951285. The cubic root of 23517979 is about 286.5057436155.

The spelling of 23517979 in words is "twenty-three million, five hundred seventeen thousand, nine hundred seventy-nine".