90161919 has 24 divisors (see below), whose sum is σ = 134918784. Its totient is φ = 57960000.

The previous prime is 90161873. The next prime is 90161921. The reversal of 90161919 is 91916109.

It is not a de Polignac number, because 90161919 - 2⁸ = 90161663 is a prime.

It is a super-2 number, since 2×90161919² = 16258343275525122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90161969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128269 + ... + 128969.

It is an arithmetic number, because the mean of its divisors is an integer number (5621616).

Almost surely, 2^90161919 is an apocalyptic number.

90161919 is a deficient number, since it is larger than the sum of its proper divisors (44756865).

90161919 is a wasteful number, since it uses less digits than its factorization.

90161919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199 (or 1196 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 90161919 is about 9495.3630262355. The cubic root of 90161919 is about 448.4090634900.

The spelling of 90161919 in words is "ninety million, one hundred sixty-one thousand, nine hundred nineteen".