31515551042 has 4 divisors (see below), whose sum is σ = 47273326566. Its totient is φ = 15757775520.

The previous prime is 31515551029. The next prime is 31515551051. The reversal of 31515551042 is 24015551513.

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., 17190094321 + 14325456721 = 131111^2 + 119689^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7878887759 + ... + 7878887762.

Almost surely, 2^31515551042 is an apocalyptic number.

31515551042 is a deficient number, since it is larger than the sum of its proper divisors (15757775524).

31515551042 is a wasteful number, since it uses less digits than its factorization.

31515551042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15757775523.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 31515551042 in words is "thirty-one billion, five hundred fifteen million, five hundred fifty-one thousand, forty-two".