31331332220131 has 4 divisors (see below), whose sum is σ = 31332460776232. Its totient is φ = 31330203664032.

The previous prime is 31331332220107. The next prime is 31331332220207. The reversal of 31331332220131 is 13102223313313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31331332220131 - 2⁵ = 31331332220099 is a prime.

It is a super-2 number, since 2×31331332220131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31331332220131.

It is not an unprimeable number, because it can be changed into a prime (31331332230131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564236406 + ... + 564291931.

It is an arithmetic number, because the mean of its divisors is an integer number (7833115194058).

Almost surely, 2^{31331332220131} is an apocalyptic number.

31331332220131 is a deficient number, since it is larger than the sum of its proper divisors (1128556101).

31331332220131 is a wasteful number, since it uses less digits than its factorization.

31331332220131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128556100.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 31331332220131 its reverse (13102223313313), we get a palindrome (44433555533444).

The spelling of 31331332220131 in words is "thirty-one trillion, three hundred thirty-one billion, three hundred thirty-two million, two hundred twenty thousand, one hundred thirty-one".