6431122981 has 2 divisors, whose sum is σ = 6431122982. Its totient is φ = 6431122980.

The previous prime is 6431122931. The next prime is 6431123003. The reversal of 6431122981 is 1892211346.

6431122981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6047550756 + 383572225 = 77766^2 + 19585^2 .

It is a cyclic number.

It is not a de Polignac number, because 6431122981 - 2⁹ = 6431122469 is a prime.

It is a super-2 number, since 2×6431122981² = 82718685593492652722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6431122981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6431122931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215561490 + 3215561491.

It is an arithmetic number, because the mean of its divisors is an integer number (3215561491).

Almost surely, 2^6431122981 is an apocalyptic number.

It is an amenable number.

6431122981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6431122981 is an equidigital number, since it uses as much as digits as its factorization.

6431122981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 6431122981 is about 80194.2827201541. The cubic root of 6431122981 is about 1859.6402531020.

The spelling of 6431122981 in words is "six billion, four hundred thirty-one million, one hundred twenty-two thousand, nine hundred eighty-one".