1931399318258 has 8 divisors (see below), whose sum is σ = 2897198047020. Its totient is φ = 965666635920.

The previous prime is 1931399318249. The next prime is 1931399318311. The reversal of 1931399318258 is 8528139931391.

It can be written as a sum of positive squares in 2 ways, for example, as 1931385606049 + 13712209 = 1389743^2 + 3703^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1931399318258.

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, 16438433 + ... + 16555508.

Almost surely, 2^{1931399318258} is an apocalyptic number.

1931399318258 is a deficient number, since it is larger than the sum of its proper divisors (965798728762).

1931399318258 is a wasteful number, since it uses less digits than its factorization.

1931399318258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33023212.

The product of its digits is 12597120, while the sum is 62.

The spelling of 1931399318258 in words is "one trillion, nine hundred thirty-one billion, three hundred ninety-nine million, three hundred eighteen thousand, two hundred fifty-eight".