31431258236 has 48 divisors (see below), whose sum is σ = 65007839232. Its totient is φ = 13012401600.

The previous prime is 31431258227. The next prime is 31431258247. The reversal of 31431258236 is 63285213413.

It is a self number, because there is not a number n which added to its sum of digits gives 31431258236.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450971 + ... + 515981.

It is an arithmetic number, because the mean of its divisors is an integer number (1354329984).

Almost surely, 2^31431258236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31431258236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32503919616).

31431258236 is an abundant number, since it is smaller than the sum of its proper divisors (33576580996).

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

31431258236 is a wasteful number, since it uses less digits than its factorization.

31431258236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65610 (or 65608 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The spelling of 31431258236 in words is "thirty-one billion, four hundred thirty-one million, two hundred fifty-eight thousand, two hundred thirty-six".