431311564781 has 2 divisors, whose sum is σ = 431311564782. Its totient is φ = 431311564780.

The previous prime is 431311564759. The next prime is 431311564841. The reversal of 431311564781 is 187465113134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377322718756 + 53988846025 = 614266^2 + 232355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431311564781 is a prime.

It is a super-2 number, since 2×431311564781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431311564751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215655782390 + 215655782391.

It is an arithmetic number, because the mean of its divisors is an integer number (215655782391).

Almost surely, 2^431311564781 is an apocalyptic number.

It is an amenable number.

431311564781 is a deficient number, since it is larger than the sum of its proper divisors (1).

431311564781 is an equidigital number, since it uses as much as digits as its factorization.

431311564781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The spelling of 431311564781 in words is "four hundred thirty-one billion, three hundred eleven million, five hundred sixty-four thousand, seven hundred eighty-one".