31291797357811 has 2 divisors, whose sum is σ = 31291797357812. Its totient is φ = 31291797357810.

The previous prime is 31291797357787. The next prime is 31291797358027. The reversal of 31291797357811 is 11875379719213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31291797357811 - 2⁷ = 31291797357683 is a prime.

It is a super-3 number, since 3×31291797357811³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (31291797351811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15645898678905 + 15645898678906.

It is an arithmetic number, because the mean of its divisors is an integer number (15645898678906).

Almost surely, 2^{31291797357811} is an apocalyptic number.

31291797357811 is a deficient number, since it is larger than the sum of its proper divisors (1).

31291797357811 is an equidigital number, since it uses as much as digits as its factorization.

31291797357811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20003760, while the sum is 64.

The spelling of 31291797357811 in words is "thirty-one trillion, two hundred ninety-one billion, seven hundred ninety-seven million, three hundred fifty-seven thousand, eight hundred eleven".