31997426346 has 12 divisors (see below), whose sum is σ = 69327757122. Its totient is φ = 10665808776.

The previous prime is 31997426303. The next prime is 31997426369. The reversal of 31997426346 is 64362479913.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 31953350025 + 44076321 = 178755^2 + 6639^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31997426292 and 31997426301.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 888817381 + ... + 888817416.

Almost surely, 2^31997426346 is an apocalyptic number.

31997426346 is an abundant number, since it is smaller than the sum of its proper divisors (37330330776).

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

31997426346 is a wasteful number, since it uses less digits than its factorization.

31997426346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777634805 (or 1777634802 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The spelling of 31997426346 in words is "thirty-one billion, nine hundred ninety-seven million, four hundred twenty-six thousand, three hundred forty-six".