90997171 has 4 divisors (see below), whose sum is σ = 93456592. Its totient is φ = 88537752.

The previous prime is 90997169. The next prime is 90997199. The reversal of 90997171 is 17179909.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90997171 - 2¹ = 90997169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90997111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1229655 + ... + 1229728.

It is an arithmetic number, because the mean of its divisors is an integer number (23364148).

Almost surely, 2^90997171 is an apocalyptic number.

90997171 is a deficient number, since it is larger than the sum of its proper divisors (2459421).

90997171 is a wasteful number, since it uses less digits than its factorization.

90997171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459420.

The product of its (nonzero) digits is 35721, while the sum is 43.

The square root of 90997171 is about 9539.2437331269. The cubic root of 90997171 is about 449.7894834256.

The spelling of 90997171 in words is "ninety million, nine hundred ninety-seven thousand, one hundred seventy-one".