90897161 has 2 divisors, whose sum is σ = 90897162. Its totient is φ = 90897160.

The previous prime is 90897151. The next prime is 90897167. The reversal of 90897161 is 16179809.

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., 81631225 + 9265936 = 9035^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 90897161 - 2¹⁰ = 90896137 is a prime.

It is not a weakly prime, because it can be changed into another prime (90897167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45448580 + 45448581.

It is an arithmetic number, because the mean of its divisors is an integer number (45448581).

Almost surely, 2^90897161 is an apocalyptic number.

It is an amenable number.

90897161 is a deficient number, since it is larger than the sum of its proper divisors (1).

90897161 is an equidigital number, since it uses as much as digits as its factorization.

90897161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 90897161 is about 9534.0002622194. Note that the first 3 decimals coincide. The cubic root of 90897161 is about 449.6246433710.

The spelling of 90897161 in words is "ninety million, eight hundred ninety-seven thousand, one hundred sixty-one".