3121323431 has 4 divisors (see below), whose sum is σ = 3193912392. Its totient is φ = 3048734472.

The previous prime is 3121323421. The next prime is 3121323467. The reversal of 3121323431 is 1343231213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121323431 is a prime.

It is a super-2 number, since 2×3121323431² = 19485319921819223522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3121323397 and 3121323406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121323421) 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, 36294416 + ... + 36294501.

It is an arithmetic number, because the mean of its divisors is an integer number (798478098).

Almost surely, 2^3121323431 is an apocalyptic number.

3121323431 is a deficient number, since it is larger than the sum of its proper divisors (72588961).

3121323431 is an equidigital number, since it uses as much as digits as its factorization.

3121323431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72588960.

The product of its digits is 1296, while the sum is 23.

The square root of 3121323431 is about 55868.8055268770. The cubic root of 3121323431 is about 1461.4352919509.

Adding to 3121323431 its reverse (1343231213), we get a palindrome (4464554644).

The spelling of 3121323431 in words is "three billion, one hundred twenty-one million, three hundred twenty-three thousand, four hundred thirty-one".