3131211220131 has 4 divisors (see below), whose sum is σ = 4174948293512. Its totient is φ = 2087474146752.

The previous prime is 3131211220073. The next prime is 3131211220153. The reversal of 3131211220131 is 1310221121313.

3131211220131 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 3131211220131 - 2¹⁷ = 3131211089059 is a prime.

It is a super-2 number, since 2×3131211220131² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3131211220098 and 3131211220107.

It is not an unprimeable number, because it can be changed into a prime (3131211220531) 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, 521868536686 + ... + 521868536691.

It is an arithmetic number, because the mean of its divisors is an integer number (1043737073378).

Almost surely, 2^{3131211220131} is an apocalyptic number.

3131211220131 is a deficient number, since it is larger than the sum of its proper divisors (1043737073381).

3131211220131 is a wasteful number, since it uses less digits than its factorization.

3131211220131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043737073380.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 3131211220131 its reverse (1310221121313), we get a palindrome (4441432341444).

The spelling of 3131211220131 in words is "three trillion, one hundred thirty-one billion, two hundred eleven million, two hundred twenty thousand, one hundred thirty-one".