90195881 has 8 divisors (see below), whose sum is σ = 91837128. Its totient is φ = 88560000.

The previous prime is 90195871. The next prime is 90195883. The reversal of 90195881 is 18859109.

90195881 = 6715² + 6716².

It can be written as a sum of positive squares in 4 ways, for example, as 4910656 + 85285225 = 2216^2 + 9235^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90195881 - 2⁶ = 90195817 is a prime.

It is a super-2 number, since 2×90195881² = 16270593898732322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90195883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49181 + ... + 50981.

It is an arithmetic number, because the mean of its divisors is an integer number (11479641).

Almost surely, 2^90195881 is an apocalyptic number.

90195881 is the 6716-th centered square number.

It is an amenable number.

90195881 is a deficient number, since it is larger than the sum of its proper divisors (1641247).

90195881 is a wasteful number, since it uses less digits than its factorization.

90195881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 90195881 is about 9497.1512044402. The cubic root of 90195881 is about 448.4653583465.

The spelling of 90195881 in words is "ninety million, one hundred ninety-five thousand, eight hundred eighty-one".