23373991 has 2 divisors, whose sum is σ = 23373992. Its totient is φ = 23373990.

The previous prime is 23373989. The next prime is 23374019. The reversal of 23373991 is 19937332.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23373991 - 2¹ = 23373989 is a prime.

Together with 23373989, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 23373991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23373191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11686995 + 11686996.

It is an arithmetic number, because the mean of its divisors is an integer number (11686996).

Almost surely, 2^23373991 is an apocalyptic number.

23373991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23373991 is an equidigital number, since it uses as much as digits as its factorization.

23373991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 37.

The square root of 23373991 is about 4834.6655520315. The cubic root of 23373991 is about 285.9198391413.

It can be divided in two parts, 2337 and 3991, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 23373991 in words is "twenty-three million, three hundred seventy-three thousand, nine hundred ninety-one".