313131251 has 2 divisors, whose sum is σ = 313131252. Its totient is φ = 313131250.

The previous prime is 313131193. The next prime is 313131257. The reversal of 313131251 is 152131313.

It is a strong prime.

It is an emirp because it is prime and its reverse (152131313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313131251 - 2¹⁰ = 313130227 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (313131257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156565625 + 156565626.

It is an arithmetic number, because the mean of its divisors is an integer number (156565626).

Almost surely, 2^313131251 is an apocalyptic number.

313131251 is a deficient number, since it is larger than the sum of its proper divisors (1).

313131251 is an equidigital number, since it uses as much as digits as its factorization.

313131251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 20.

The square root of 313131251 is about 17695.5149967442. The cubic root of 313131251 is about 679.0610245177.

Adding to 313131251 its reverse (152131313), we get a palindrome (465262564).

The spelling of 313131251 in words is "three hundred thirteen million, one hundred thirty-one thousand, two hundred fifty-one".