3121331431 has 2 divisors, whose sum is σ = 3121331432. Its totient is φ = 3121331430.

The previous prime is 3121331401. The next prime is 3121331443. The reversal of 3121331431 is 1341331213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3121331431 - 2¹³ = 3121323239 is a prime.

It is a super-2 number, since 2×3121331431² = 19485419804297015522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121331401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560665715 + 1560665716.

It is an arithmetic number, because the mean of its divisors is an integer number (1560665716).

Almost surely, 2^3121331431 is an apocalyptic number.

3121331431 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121331431 is an equidigital number, since it uses as much as digits as its factorization.

3121331431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 22.

The square root of 3121331431 is about 55868.8771231354. The cubic root of 3121331431 is about 1461.4365405102.

Adding to 3121331431 its reverse (1341331213), we get a palindrome (4462662644).

The spelling of 3121331431 in words is "three billion, one hundred twenty-one million, three hundred thirty-one thousand, four hundred thirty-one".