31131203130 has 48 divisors (see below), whose sum is σ = 81425844864. Its totient is φ = 8251939680.

The previous prime is 31131203039. The next prime is 31131203143. The reversal of 31131203130 is 3130213113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1020606 + ... + 1050665.

It is an arithmetic number, because the mean of its divisors is an integer number (1696371768).

Almost surely, 2^31131203130 is an apocalyptic number.

31131203130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31131203130 is an abundant number, since it is smaller than the sum of its proper divisors (50294641734).

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

31131203130 is a wasteful number, since it uses less digits than its factorization.

31131203130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071451 (or 2071448 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31131203130 its reverse (3130213113), we get a palindrome (34261416243).

The spelling of 31131203130 in words is "thirty-one billion, one hundred thirty-one million, two hundred three thousand, one hundred thirty".