231139907 has 2 divisors, whose sum is σ = 231139908. Its totient is φ = 231139906.

The previous prime is 231139877. The next prime is 231139913. The reversal of 231139907 is 709931132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231139907 - 2¹⁴ = 231123523 is a prime.

It is not a weakly prime, because it can be changed into another prime (231139957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115569953 + 115569954.

It is an arithmetic number, because the mean of its divisors is an integer number (115569954).

Almost surely, 2^231139907 is an apocalyptic number.

231139907 is a deficient number, since it is larger than the sum of its proper divisors (1).

231139907 is an equidigital number, since it uses as much as digits as its factorization.

231139907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 231139907 is about 15203.2860592702. The cubic root of 231139907 is about 613.7030920274.

The spelling of 231139907 in words is "two hundred thirty-one million, one hundred thirty-nine thousand, nine hundred seven".