31683261517 has 2 divisors, whose sum is σ = 31683261518. Its totient is φ = 31683261516.

The previous prime is 31683261503. The next prime is 31683261523. The reversal of 31683261517 is 71516238613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30937643881 + 745617636 = 175891^2 + 27306^2 .

It is a cyclic number.

It is not a de Polignac number, because 31683261517 - 2²³ = 31674872909 is a prime.

It is a super-2 number, since 2×31683261517² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31683261587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15841630758 + 15841630759.

It is an arithmetic number, because the mean of its divisors is an integer number (15841630759).

Almost surely, 2^31683261517 is an apocalyptic number.

It is an amenable number.

31683261517 is a deficient number, since it is larger than the sum of its proper divisors (1).

31683261517 is an equidigital number, since it uses as much as digits as its factorization.

31683261517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The spelling of 31683261517 in words is "thirty-one billion, six hundred eighty-three million, two hundred sixty-one thousand, five hundred seventeen".