23139491 has 2 divisors, whose sum is σ = 23139492. Its totient is φ = 23139490.

The previous prime is 23139481. The next prime is 23139497. The reversal of 23139491 is 19493132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23139491 - 2⁶ = 23139427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23139497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11569745 + 11569746.

It is an arithmetic number, because the mean of its divisors is an integer number (11569746).

Almost surely, 2^23139491 is an apocalyptic number.

23139491 is a deficient number, since it is larger than the sum of its proper divisors (1).

23139491 is an equidigital number, since it uses as much as digits as its factorization.

23139491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 23139491 is about 4810.3524818874. The cubic root of 23139491 is about 284.9604582465.

The spelling of 23139491 in words is "twenty-three million, one hundred thirty-nine thousand, four hundred ninety-one".