231406517 has 2 divisors, whose sum is σ = 231406518. Its totient is φ = 231406516.

The previous prime is 231406493. The next prime is 231406523. The reversal of 231406517 is 715604132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133772356 + 97634161 = 11566^2 + 9881^2 .

It is a cyclic number.

It is not a de Polignac number, because 231406517 - 2¹⁸ = 231144373 is a prime.

It is a super-2 number, since 2×231406517² = 107097952220142578, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231406517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231406117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115703258 + 115703259.

It is an arithmetic number, because the mean of its divisors is an integer number (115703259).

Almost surely, 2^231406517 is an apocalyptic number.

It is an amenable number.

231406517 is a deficient number, since it is larger than the sum of its proper divisors (1).

231406517 is an equidigital number, since it uses as much as digits as its factorization.

231406517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 231406517 is about 15212.0517025153. The cubic root of 231406517 is about 613.9389614545.

The spelling of 231406517 in words is "two hundred thirty-one million, four hundred six thousand, five hundred seventeen".