23139139 has 2 divisors, whose sum is σ = 23139140. Its totient is φ = 23139138.

The previous prime is 23139121. The next prime is 23139143. The reversal of 23139139 is 93193132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23139139 - 2¹¹ = 23137091 is a prime.

It is a super-2 number, since 2×23139139² = 1070839507322642, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1456438 and since 23139139 and 1456438 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23139139.

It is not a weakly prime, because it can be changed into another prime (23139119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11569569 + 11569570.

It is an arithmetic number, because the mean of its divisors is an integer number (11569570).

Almost surely, 2^23139139 is an apocalyptic number.

23139139 is a deficient number, since it is larger than the sum of its proper divisors (1).

23139139 is an equidigital number, since it uses as much as digits as its factorization.

23139139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 31.

The square root of 23139139 is about 4810.3158939928. The cubic root of 23139139 is about 284.9590132913.

The spelling of 23139139 in words is "twenty-three million, one hundred thirty-nine thousand, one hundred thirty-nine".