31919742252 has 144 divisors (see below), whose sum is σ = 84799906464. Its totient is φ = 10497600000.

The previous prime is 31919742149. The next prime is 31919742271. The reversal of 31919742252 is 25224791913.

31919742252 is a `hidden beast` number, since 3 + 1 + 91 + 97 + 422 + 52 = 666.

It is a super-2 number, since 2×31919742252² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31919742198 and 31919742207.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53110752 + ... + 53111352.

Almost surely, 2^31919742252 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 31919742252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42399953232).

31919742252 is an abundant number, since it is smaller than the sum of its proper divisors (52880164212).

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

31919742252 is a wasteful number, since it uses less digits than its factorization.

31919742252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262 (or 1248 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 31919742252 in words is "thirty-one billion, nine hundred nineteen million, seven hundred forty-two thousand, two hundred fifty-two".