31401040978 has 8 divisors (see below), whose sum is σ = 47102544972. Its totient is φ = 15700192656.

The previous prime is 31401040861. The next prime is 31401040991. The reversal of 31401040978 is 87904010413.

It can be written as a sum of positive squares in 2 ways, for example, as 31192151769 + 208889209 = 176613^2 + 14453^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18325 + ... + 251272.

Almost surely, 2^31401040978 is an apocalyptic number.

31401040978 is a deficient number, since it is larger than the sum of its proper divisors (15701503994).

31401040978 is a wasteful number, since it uses less digits than its factorization.

31401040978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327836.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 31401040978 in words is "thirty-one billion, four hundred one million, forty thousand, nine hundred seventy-eight".