31131013123131 has 8 divisors (see below), whose sum is σ = 41508052144704. Its totient is φ = 20753991425160.

The previous prime is 31131013123117. The next prime is 31131013123151. The reversal of 31131013123131 is 13132131013113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31131013123131 - 2⁹ = 31131013122619 is a prime.

It is a super-2 number, since 2×31131013123131² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31131013123151) 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, 695560 + ... + 7921226.

It is an arithmetic number, because the mean of its divisors is an integer number (5188506518088).

Almost surely, 2^{31131013123131} is an apocalyptic number.

31131013123131 is a deficient number, since it is larger than the sum of its proper divisors (10377039021573).

31131013123131 is a wasteful number, since it uses less digits than its factorization.

31131013123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8661801.

The product of its (nonzero) digits is 486, while the sum is 24.

Adding to 31131013123131 its reverse (13132131013113), we get a palindrome (44263144136244).

The spelling of 31131013123131 in words is "thirty-one trillion, one hundred thirty-one billion, thirteen million, one hundred twenty-three thousand, one hundred thirty-one".