312121130231 has 2 divisors, whose sum is σ = 312121130232. Its totient is φ = 312121130230.

The previous prime is 312121130201. The next prime is 312121130249. The reversal of 312121130231 is 132031121213.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312121130231 is a prime.

It is a super-2 number, since 2×312121130231² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312121130201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156060565115 + 156060565116.

It is an arithmetic number, because the mean of its divisors is an integer number (156060565116).

Almost surely, 2^312121130231 is an apocalyptic number.

312121130231 is a deficient number, since it is larger than the sum of its proper divisors (1).

312121130231 is an equidigital number, since it uses as much as digits as its factorization.

312121130231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 312121130231 its reverse (132031121213), we get a palindrome (444152251444).

The spelling of 312121130231 in words is "three hundred twelve billion, one hundred twenty-one million, one hundred thirty thousand, two hundred thirty-one".