31139199091778 has 8 divisors (see below), whose sum is σ = 49456375028172. Its totient is φ = 14653740749056.

The previous prime is 31139199091757. The next prime is 31139199091789. The reversal of 31139199091778 is 87719099193113.

It can be written as a sum of positive squares in 2 ways, for example, as 30021161430649 + 1118037661129 = 5479157^2 + 1057373^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457929398375 + ... + 457929398442.

Almost surely, 2^{31139199091778} is an apocalyptic number.

31139199091778 is a deficient number, since it is larger than the sum of its proper divisors (18317175936394).

31139199091778 is a wasteful number, since it uses less digits than its factorization.

31139199091778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915858796836.

The product of its (nonzero) digits is 23147208, while the sum is 68.

The spelling of 31139199091778 in words is "thirty-one trillion, one hundred thirty-nine billion, one hundred ninety-nine million, ninety-one thousand, seven hundred seventy-eight".