3131994728978 has 16 divisors (see below), whose sum is σ = 4738006579104. Its totient is φ = 1552686848160.

The previous prime is 3131994728953. The next prime is 3131994729001. The reversal of 3131994728978 is 8798274991313.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6684308 + ... + 7137503.

It is an arithmetic number, because the mean of its divisors is an integer number (296125411194).

Almost surely, 2^{3131994728978} is an apocalyptic number.

3131994728978 is a deficient number, since it is larger than the sum of its proper divisors (1606011850126).

3131994728978 is a wasteful number, since it uses less digits than its factorization.

3131994728978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13822777.

The product of its digits is 164602368, while the sum is 71.

The spelling of 3131994728978 in words is "three trillion, one hundred thirty-one billion, nine hundred ninety-four million, seven hundred twenty-eight thousand, nine hundred seventy-eight".