31996702081 has 4 divisors (see below), whose sum is σ = 31997713072. Its totient is φ = 31995691092.

The previous prime is 31996702063. The next prime is 31996702091. The reversal of 31996702081 is 18020769913.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31996702081 - 2²³ = 31988313473 is a prime.

It is a super-2 number, since 2×31996702081² (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 (31996702021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456435 + ... + 521848.

It is an arithmetic number, because the mean of its divisors is an integer number (7999428268).

Almost surely, 2^31996702081 is an apocalyptic number.

It is an amenable number.

31996702081 is a deficient number, since it is larger than the sum of its proper divisors (1010991).

31996702081 is an equidigital number, since it uses as much as digits as its factorization.

31996702081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010990.

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 31996702081 in words is "thirty-one billion, nine hundred ninety-six million, seven hundred two thousand, eighty-one".