231139177 has 2 divisors, whose sum is σ = 231139178. Its totient is φ = 231139176.

The previous prime is 231139163. The next prime is 231139211. The reversal of 231139177 is 771931132.

It is an a-pointer prime, because the next prime (231139211) can be obtained adding 231139177 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174874176 + 56265001 = 13224^2 + 7501^2 .

It is a cyclic number.

It is not a de Polignac number, because 231139177 - 2²⁷ = 96921449 is a prime.

It is not a weakly prime, because it can be changed into another prime (231139477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115569588 + 115569589.

It is an arithmetic number, because the mean of its divisors is an integer number (115569589).

Almost surely, 2^231139177 is an apocalyptic number.

It is an amenable number.

231139177 is a deficient number, since it is larger than the sum of its proper divisors (1).

231139177 is an equidigital number, since it uses as much as digits as its factorization.

231139177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 34.

The square root of 231139177 is about 15203.2620512836. The cubic root of 231139177 is about 613.7024459487.

The spelling of 231139177 in words is "two hundred thirty-one million, one hundred thirty-nine thousand, one hundred seventy-seven".