31131010780 has 12 divisors (see below), whose sum is σ = 65375122680. Its totient is φ = 12452404304.

The previous prime is 31131010697. The next prime is 31131010783. The reversal of 31131010780 is 8701013113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131010783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778275250 + ... + 778275289.

It is an arithmetic number, because the mean of its divisors is an integer number (5447926890).

Almost surely, 2^31131010780 is an apocalyptic number.

It is an amenable number.

31131010780 is an abundant number, since it is smaller than the sum of its proper divisors (34244111900).

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

31131010780 is a wasteful number, since it uses less digits than its factorization.

31131010780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556550548 (or 1556550546 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 31131010780 its reverse (8701013113), we get a palindrome (39832023893).

The spelling of 31131010780 in words is "thirty-one billion, one hundred thirty-one million, ten thousand, seven hundred eighty".