90610856081 has 2 divisors, whose sum is σ = 90610856082. Its totient is φ = 90610856080.

The previous prime is 90610856057. The next prime is 90610856153. The reversal of 90610856081 is 18065801609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59333165056 + 31277691025 = 243584^2 + 176855^2 .

It is an emirp because it is prime and its reverse (18065801609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90610856081 - 2³⁰ = 89537114257 is a prime.

It is a super-2 number, since 2×90610856081² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90610856981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45305428040 + 45305428041.

It is an arithmetic number, because the mean of its divisors is an integer number (45305428041).

Almost surely, 2^90610856081 is an apocalyptic number.

It is an amenable number.

90610856081 is a deficient number, since it is larger than the sum of its proper divisors (1).

90610856081 is an equidigital number, since it uses as much as digits as its factorization.

90610856081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 90610856081 in words is "ninety billion, six hundred ten million, eight hundred fifty-six thousand, eighty-one".