231189139 has 2 divisors, whose sum is σ = 231189140. Its totient is φ = 231189138.

The previous prime is 231189107. The next prime is 231189151. The reversal of 231189139 is 931981132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231189139 - 2⁵ = 231189107 is a prime.

It is a super-2 number, since 2×231189139² = 106896835983122642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231189098 and 231189107.

It is not a weakly prime, because it can be changed into another prime (231180139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115594569 + 115594570.

It is an arithmetic number, because the mean of its divisors is an integer number (115594570).

Almost surely, 2^231189139 is an apocalyptic number.

231189139 is a deficient number, since it is larger than the sum of its proper divisors (1).

231189139 is an equidigital number, since it uses as much as digits as its factorization.

231189139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 231189139 is about 15204.9050967114. The cubic root of 231189139 is about 613.7466611455.

The spelling of 231189139 in words is "two hundred thirty-one million, one hundred eighty-nine thousand, one hundred thirty-nine".