31999999999997 has 2 divisors, whose sum is σ = 31999999999998. Its totient is φ = 31999999999996.

The previous prime is 31999999999993. The next prime is 32000000000029. The reversal of 31999999999997 is 79999999999913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24235200401476 + 7764799598521 = 4922926^2 + 2786539^2 .

It is a cyclic number.

It is not a de Polignac number, because 31999999999997 - 2² = 31999999999993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31999999999991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15999999999998 + 15999999999999.

It is an arithmetic number, because the mean of its divisors is an integer number (15999999999999).

Almost surely, 2^{31999999999997} is an apocalyptic number.

It is an amenable number.

31999999999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31999999999997 is an equidigital number, since it uses as much as digits as its factorization.

31999999999997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 659002251789, while the sum is 110.

The spelling of 31999999999997 in words is "thirty-one trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".