231490517 has 2 divisors, whose sum is σ = 231490518. Its totient is φ = 231490516.

The previous prime is 231490489. The next prime is 231490549. The reversal of 231490517 is 715094132.

It is an a-pointer prime, because the next prime (231490549) can be obtained adding 231490517 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143017681 + 88472836 = 11959^2 + 9406^2 .

It is a cyclic number.

It is not a de Polignac number, because 231490517 - 2⁸ = 231490261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231490577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115745258 + 115745259.

It is an arithmetic number, because the mean of its divisors is an integer number (115745259).

Almost surely, 2^231490517 is an apocalyptic number.

It is an amenable number.

231490517 is a deficient number, since it is larger than the sum of its proper divisors (1).

231490517 is an equidigital number, since it uses as much as digits as its factorization.

231490517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 231490517 is about 15214.8124207957. The cubic root of 231490517 is about 614.0132385818.

The spelling of 231490517 in words is "two hundred thirty-one million, four hundred ninety thousand, five hundred seventeen".