31957773497 has 8 divisors (see below), whose sum is σ = 34420417416. Its totient is φ = 29495751552.

The previous prime is 31957773479. The next prime is 31957773517. The reversal of 31957773497 is 79437775913.

It can be written as a sum of positive squares in 4 ways, for example, as 5160410896 + 26797362601 = 71836^2 + 163699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31957773497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31957773467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45908 + ... + 256949.

It is an arithmetic number, because the mean of its divisors is an integer number (4302552177).

Almost surely, 2^31957773497 is an apocalyptic number.

It is an amenable number.

31957773497 is a deficient number, since it is larger than the sum of its proper divisors (2462643919).

31957773497 is a wasteful number, since it uses less digits than its factorization.

31957773497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310987.

The product of its digits is 35006580, while the sum is 62.

The spelling of 31957773497 in words is "thirty-one billion, nine hundred fifty-seven million, seven hundred seventy-three thousand, four hundred ninety-seven".