31313233051540 has 48 divisors (see below), whose sum is σ = 72021570272064. Its totient is φ = 11341265120000.

The previous prime is 31313233051517. The next prime is 31313233051549. The reversal of 31313233051540 is 4515033231313.

It is a junction number, because it is equal to n+sod(n) for n = 31313233051496 and 31313233051505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313233051549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283476409 + ... + 283586848.

It is an arithmetic number, because the mean of its divisors is an integer number (1500449380668).

Almost surely, 2^{31313233051540} is an apocalyptic number.

It is an amenable number.

31313233051540 is an abundant number, since it is smaller than the sum of its proper divisors (40708337220524).

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

31313233051540 is a wasteful number, since it uses less digits than its factorization.

31313233051540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567063528 (or 567063526 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 34.

Adding to 31313233051540 its reverse (4515033231313), we get a palindrome (35828266282853).

The spelling of 31313233051540 in words is "thirty-one trillion, three hundred thirteen billion, two hundred thirty-three million, fifty-one thousand, five hundred forty".