3121243331 has 2 divisors, whose sum is σ = 3121243332. Its totient is φ = 3121243330.

The previous prime is 3121243327. The next prime is 3121243357. The reversal of 3121243331 is 1333421213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3121243331 - 2² = 3121243327 is a prime.

It is a super-2 number, since 2×3121243331² = 19484319862623951122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3121243297 and 3121243306.

It is not a weakly prime, because it can be changed into another prime (3121243381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560621665 + 1560621666.

It is an arithmetic number, because the mean of its divisors is an integer number (1560621666).

Almost surely, 2^3121243331 is an apocalyptic number.

3121243331 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121243331 is an equidigital number, since it uses as much as digits as its factorization.

3121243331 is an evil number, because the sum of its binary digits is even.

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

The square root of 3121243331 is about 55868.0886642813. The cubic root of 3121243331 is about 1461.4227906331.

Adding to 3121243331 its reverse (1333421213), we get a palindrome (4454664544).

The spelling of 3121243331 in words is "three billion, one hundred twenty-one million, two hundred forty-three thousand, three hundred thirty-one".