31431742886 has 4 divisors (see below), whose sum is σ = 47147614332. Its totient is φ = 15715871442.

The previous prime is 31431742879. The next prime is 31431742913. The reversal of 31431742886 is 68824713413.

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

It is a super-2 number, since 2×31431742886² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31431742886.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7857935720 + ... + 7857935723.

It is an arithmetic number, because the mean of its divisors is an integer number (11786903583).

Almost surely, 2^31431742886 is an apocalyptic number.

31431742886 is a deficient number, since it is larger than the sum of its proper divisors (15715871446).

31431742886 is a wasteful number, since it uses less digits than its factorization.

31431742886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15715871445.

The product of its digits is 774144, while the sum is 47.

The spelling of 31431742886 in words is "thirty-one billion, four hundred thirty-one million, seven hundred forty-two thousand, eight hundred eighty-six".