231292517 has 2 divisors, whose sum is σ = 231292518. Its totient is φ = 231292516.

The previous prime is 231292471. The next prime is 231292549. The reversal of 231292517 is 715292132.

It is an a-pointer prime, because the next prime (231292549) can be obtained adding 231292517 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143664196 + 87628321 = 11986^2 + 9361^2 .

It is a cyclic number.

It is not a de Polignac number, because 231292517 - 2⁸ = 231292261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231492517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115646258 + 115646259.

It is an arithmetic number, because the mean of its divisors is an integer number (115646259).

Almost surely, 2^231292517 is an apocalyptic number.

It is an amenable number.

231292517 is a deficient number, since it is larger than the sum of its proper divisors (1).

231292517 is an equidigital number, since it uses as much as digits as its factorization.

231292517 is an evil number, because the sum of its binary digits is even.

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

The square root of 231292517 is about 15208.3042118443. The cubic root of 231292517 is about 613.8381280254.

The spelling of 231292517 in words is "two hundred thirty-one million, two hundred ninety-two thousand, five hundred seventeen".