23681491 has 2 divisors, whose sum is σ = 23681492. Its totient is φ = 23681490.

The previous prime is 23681473. The next prime is 23681501. The reversal of 23681491 is 19418632.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23681491 - 2⁷ = 23681363 is a prime.

It is not a weakly prime, because it can be changed into another prime (23681401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11840745 + 11840746.

It is an arithmetic number, because the mean of its divisors is an integer number (11840746).

Almost surely, 2^23681491 is an apocalyptic number.

23681491 is a deficient number, since it is larger than the sum of its proper divisors (1).

23681491 is an equidigital number, since it uses as much as digits as its factorization.

23681491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 23681491 is about 4866.3632211334. The cubic root of 23681491 is about 287.1682009664.

The spelling of 23681491 in words is "twenty-three million, six hundred eighty-one thousand, four hundred ninety-one".