31971077042 has 4 divisors (see below), whose sum is σ = 47956615566. Its totient is φ = 15985538520.

The previous prime is 31971077041. The next prime is 31971077087. The reversal of 31971077042 is 24077017913.

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

It can be written as a sum of positive squares in only one way, i.e., 22499700001 + 9471377041 = 149999^2 + 97321^2 .

It is not an unprimeable number, because it can be changed into a prime (31971077041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7992769259 + ... + 7992769262.

Almost surely, 2^31971077042 is an apocalyptic number.

31971077042 is a deficient number, since it is larger than the sum of its proper divisors (15985538524).

31971077042 is a wasteful number, since it uses less digits than its factorization.

31971077042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15985538523.

The product of its (nonzero) digits is 74088, while the sum is 41.

The spelling of 31971077042 in words is "thirty-one billion, nine hundred seventy-one million, seventy-seven thousand, forty-two".