1931311404078 has 32 divisors (see below), whose sum is σ = 4414643299584. Its totient is φ = 551776104192.

The previous prime is 1931311404059. The next prime is 1931311404097. The reversal of 1931311404078 is 8704041131391.

It is an interprime number because it is at equal distance from previous prime (1931311404059) and next prime (1931311404097).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259875 + ... + 1982462.

It is an arithmetic number, because the mean of its divisors is an integer number (137957603112).

Almost surely, 2^{1931311404078} is an apocalyptic number.

1931311404078 is an abundant number, since it is smaller than the sum of its proper divisors (2483331895506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1931311404078 is a wasteful number, since it uses less digits than its factorization.

1931311404078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262856.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 1931311404078 in words is "one trillion, nine hundred thirty-one billion, three hundred eleven million, four hundred four thousand, seventy-eight".