90798881 has 2 divisors, whose sum is σ = 90798882. Its totient is φ = 90798880.

The previous prime is 90798859. The next prime is 90798889. The reversal of 90798881 is 18889709.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89397025 + 1401856 = 9455^2 + 1184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90798881 is a prime.

It is a super-2 number, since 2×90798881² = 16488873581704322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90798889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45399440 + 45399441.

It is an arithmetic number, because the mean of its divisors is an integer number (45399441).

Almost surely, 2^90798881 is an apocalyptic number.

It is an amenable number.

90798881 is a deficient number, since it is larger than the sum of its proper divisors (1).

90798881 is an equidigital number, since it uses as much as digits as its factorization.

90798881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 90798881 is about 9528.8446833811. The cubic root of 90798881 is about 449.4625369307.

The spelling of 90798881 in words is "ninety million, seven hundred ninety-eight thousand, eight hundred eighty-one".