31942997873 has 4 divisors (see below), whose sum is σ = 32108505828. Its totient is φ = 31777489920.

The previous prime is 31942997843. The next prime is 31942997899. The reversal of 31942997873 is 37879924913.

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 2354869729 + 29588128144 = 48527^2 + 172012^2 .

It is a cyclic number.

It is not a de Polignac number, because 31942997873 - 2⁸ = 31942997617 is a prime.

It is a super-2 number, since 2×31942997873² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31942997803) 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, 82753688 + ... + 82754073.

It is an arithmetic number, because the mean of its divisors is an integer number (8027126457).

Almost surely, 2^31942997873 is an apocalyptic number.

It is an amenable number.

31942997873 is a deficient number, since it is larger than the sum of its proper divisors (165507955).

31942997873 is a wasteful number, since it uses less digits than its factorization.

31942997873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165507954.

The product of its digits is 20575296, while the sum is 62.

The spelling of 31942997873 in words is "thirty-one billion, nine hundred forty-two million, nine hundred ninety-seven thousand, eight hundred seventy-three".