81122270413 has 2 divisors, whose sum is σ = 81122270414. Its totient is φ = 81122270412.

The previous prime is 81122270387. The next prime is 81122270473. The reversal of 81122270413 is 31407222118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53964219204 + 27158051209 = 232302^2 + 164797^2 .

It is a cyclic number.

It is not a de Polignac number, because 81122270413 - 2²⁹ = 80585399501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81122270473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40561135206 + 40561135207.

It is an arithmetic number, because the mean of its divisors is an integer number (40561135207).

Almost surely, 2^81122270413 is an apocalyptic number.

It is an amenable number.

81122270413 is a deficient number, since it is larger than the sum of its proper divisors (1).

81122270413 is an equidigital number, since it uses as much as digits as its factorization.

81122270413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The spelling of 81122270413 in words is "eighty-one billion, one hundred twenty-two million, two hundred seventy thousand, four hundred thirteen".