23686991 has 2 divisors, whose sum is σ = 23686992. Its totient is φ = 23686990.

The previous prime is 23686973. The next prime is 23687003. The reversal of 23686991 is 19968632.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23686991 - 2¹⁴ = 23670607 is a prime.

It is a super-2 number, since 2×23686991² = 1122147085268162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23686921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11843495 + 11843496.

It is an arithmetic number, because the mean of its divisors is an integer number (11843496).

Almost surely, 2^23686991 is an apocalyptic number.

23686991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23686991 is an equidigital number, since it uses as much as digits as its factorization.

23686991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 23686991 is about 4866.9282920544. The cubic root of 23686991 is about 287.1904307442.

The spelling of 23686991 in words is "twenty-three million, six hundred eighty-six thousand, nine hundred ninety-one".