31654966997 has 4 divisors (see below), whose sum is σ = 31657661196. Its totient is φ = 31652272800.

The previous prime is 31654966957. The next prime is 31654967033. The reversal of 31654966997 is 79966945613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23827318321 + 7827648676 = 154361^2 + 88474^2 .

It is a cyclic number.

It is not a de Polignac number, because 31654966997 - 2¹⁶ = 31654901461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31654966927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1329398 + ... + 1352999.

It is an arithmetic number, because the mean of its divisors is an integer number (7914415299).

Almost surely, 2^31654966997 is an apocalyptic number.

It is an amenable number.

31654966997 is a deficient number, since it is larger than the sum of its proper divisors (2694199).

31654966997 is a wasteful number, since it uses less digits than its factorization.

31654966997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694198.

The product of its digits is 66134880, while the sum is 65.

The spelling of 31654966997 in words is "thirty-one billion, six hundred fifty-four million, nine hundred sixty-six thousand, nine hundred ninety-seven".