31941863436 has 72 divisors (see below), whose sum is σ = 86948324400. Its totient is φ = 9100038528.

The previous prime is 31941863423. The next prime is 31941863449. The reversal of 31941863436 is 63436814913.

It is an interprime number because it is at equal distance from previous prime (31941863423) and next prime (31941863449).

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 23 ways as a sum of consecutive naturals, for example, 127386 + ... + 283038.

Almost surely, 2^31941863436 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 31941863436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43474162200).

31941863436 is an abundant number, since it is smaller than the sum of its proper divisors (55006460964).

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

31941863436 is a wasteful number, since it uses less digits than its factorization.

31941863436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156023 (or 156014 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 48.

The spelling of 31941863436 in words is "thirty-one billion, nine hundred forty-one million, eight hundred sixty-three thousand, four hundred thirty-six".