31311130133820 has 24 divisors (see below), whose sum is σ = 87671164374864. Its totient is φ = 8349634702336.

The previous prime is 31311130133819. The next prime is 31311130133821. The reversal of 31311130133820 is 2833103111313.

It is an interprime number because it is at equal distance from previous prime (31311130133819) and next prime (31311130133821).

It is a super-2 number, since 2×31311130133820² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311130133821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260926084389 + ... + 260926084508.

It is an arithmetic number, because the mean of its divisors is an integer number (3652965182286).

Almost surely, 2^{31311130133820} is an apocalyptic number.

31311130133820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31311130133820 is an abundant number, since it is smaller than the sum of its proper divisors (56360034241044).

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

31311130133820 is a wasteful number, since it uses less digits than its factorization.

31311130133820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521852168909 (or 521852168907 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The spelling of 31311130133820 in words is "thirty-one trillion, three hundred eleven billion, one hundred thirty million, one hundred thirty-three thousand, eight hundred twenty".