3121313131 has 2 divisors, whose sum is σ = 3121313132. Its totient is φ = 3121313130.

The previous prime is 3121313093. The next prime is 3121313161. The reversal of 3121313131 is 1313131213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3121313131 - 2²³ = 3112924523 is a prime.

It is a super-2 number, since 2×3121313131² = 19485191323506046322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3121313099 and 3121313108.

It is not a weakly prime, because it can be changed into another prime (3121313161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560656565 + 1560656566.

It is an arithmetic number, because the mean of its divisors is an integer number (1560656566).

Almost surely, 2^3121313131 is an apocalyptic number.

3121313131 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121313131 is an equidigital number, since it uses as much as digits as its factorization.

3121313131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 19.

The square root of 3121313131 is about 55868.7133465592. The cubic root of 3121313131 is about 1461.4336844276.

Adding to 3121313131 its reverse (1313131213), we get a palindrome (4434444344).

It can be divided in two parts, 31213 and 13131, that added together give a palindrome (44344).

The spelling of 3121313131 in words is "three billion, one hundred twenty-one million, three hundred thirteen thousand, one hundred thirty-one".