90210881 has 2 divisors, whose sum is σ = 90210882. Its totient is φ = 90210880.

The previous prime is 90210839. The next prime is 90210937. The reversal of 90210881 is 18801209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61481281 + 28729600 = 7841^2 + 5360^2 .

It is a cyclic number.

It is not a de Polignac number, because 90210881 - 2⁶ = 90210817 is a prime.

It is a super-2 number, since 2×90210881² = 16276006101592322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90210821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45105440 + 45105441.

It is an arithmetic number, because the mean of its divisors is an integer number (45105441).

Almost surely, 2^90210881 is an apocalyptic number.

It is an amenable number.

90210881 is a deficient number, since it is larger than the sum of its proper divisors (1).

90210881 is an equidigital number, since it uses as much as digits as its factorization.

90210881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 90210881 is about 9497.9408821070. The cubic root of 90210881 is about 448.4902176026.

The spelling of 90210881 in words is "ninety million, two hundred ten thousand, eight hundred eighty-one".