31131303534 has 128 divisors (see below), whose sum is σ = 72146350080. Its totient is φ = 9942175872.

The previous prime is 31131303479. The next prime is 31131303587. The reversal of 31131303534 is 43530313113.

31131303534 is a `hidden beast` number, since 3 + 113 + 13 + 0 + 3 + 534 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31131303498 and 31131303507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 47673952 + ... + 47674604.

It is an arithmetic number, because the mean of its divisors is an integer number (563643360).

Almost surely, 2^31131303534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31131303534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36073175040).

31131303534 is an abundant number, since it is smaller than the sum of its proper divisors (41015046546).

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

31131303534 is a wasteful number, since it uses less digits than its factorization.

31131303534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 27.

Adding to 31131303534 its reverse (43530313113), we get a palindrome (74661616647).

The spelling of 31131303534 in words is "thirty-one billion, one hundred thirty-one million, three hundred three thousand, five hundred thirty-four".