231617137 has 2 divisors, whose sum is σ = 231617138. Its totient is φ = 231617136.

The previous prime is 231617131. The next prime is 231617149. The reversal of 231617137 is 731716132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165096801 + 66520336 = 12849^2 + 8156^2 .

It is a cyclic number.

It is not a de Polignac number, because 231617137 - 2²³ = 223228529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231617099 and 231617108.

It is not a weakly prime, because it can be changed into another prime (231617131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115808568 + 115808569.

It is an arithmetic number, because the mean of its divisors is an integer number (115808569).

Almost surely, 2^231617137 is an apocalyptic number.

It is an amenable number.

231617137 is a deficient number, since it is larger than the sum of its proper divisors (1).

231617137 is an equidigital number, since it uses as much as digits as its factorization.

231617137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 31.

The square root of 231617137 is about 15218.9729285520. The cubic root of 231617137 is about 614.1251685598.

The spelling of 231617137 in words is "two hundred thirty-one million, six hundred seventeen thousand, one hundred thirty-seven".