3121431253 has 2 divisors, whose sum is σ = 3121431254. Its totient is φ = 3121431252.

The previous prime is 3121431239. The next prime is 3121431317. The reversal of 3121431253 is 3521341213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2841103204 + 280328049 = 53302^2 + 16743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121431253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121431553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560715626 + 1560715627.

It is an arithmetic number, because the mean of its divisors is an integer number (1560715627).

Almost surely, 2^3121431253 is an apocalyptic number.

It is an amenable number.

3121431253 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121431253 is an equidigital number, since it uses as much as digits as its factorization.

3121431253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 3121431253 is about 55869.7704756338. The cubic root of 3121431253 is about 1461.4521195418.

Adding to 3121431253 its reverse (3521341213), we get a palindrome (6642772466).

The spelling of 3121431253 in words is "three billion, one hundred twenty-one million, four hundred thirty-one thousand, two hundred fifty-three".