31431401978 has 16 divisors (see below), whose sum is σ = 47292180480. Its totient is φ = 15667400736.

The previous prime is 31431401977. The next prime is 31431402007. The reversal of 31431401978 is 87910413413.

It is not an unprimeable number, because it can be changed into a prime (31431401971) 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 7 ways as a sum of consecutive naturals, for example, 1119326 + ... + 1147062.

It is an arithmetic number, because the mean of its divisors is an integer number (2955761280).

Almost surely, 2^31431401978 is an apocalyptic number.

31431401978 is a deficient number, since it is larger than the sum of its proper divisors (15860778502).

31431401978 is a wasteful number, since it uses less digits than its factorization.

31431401978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29461.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 31431401978 in words is "thirty-one billion, four hundred thirty-one million, four hundred one thousand, nine hundred seventy-eight".