231430139 has 2 divisors, whose sum is σ = 231430140. Its totient is φ = 231430138.

The previous prime is 231430123. The next prime is 231430141. The reversal of 231430139 is 931034132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231430139 - 2⁴ = 231430123 is a prime.

Together with 231430141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231430169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115715069 + 115715070.

It is an arithmetic number, because the mean of its divisors is an integer number (115715070).

Almost surely, 2^231430139 is an apocalyptic number.

231430139 is a deficient number, since it is larger than the sum of its proper divisors (1).

231430139 is an equidigital number, since it uses as much as digits as its factorization.

231430139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 231430139 is about 15212.8281065685. The cubic root of 231430139 is about 613.9598510602.

The spelling of 231430139 in words is "two hundred thirty-one million, four hundred thirty thousand, one hundred thirty-nine".