90889291 has 4 divisors (see below), whose sum is σ = 91826392. Its totient is φ = 89952192.

The previous prime is 90889247. The next prime is 90889343. The reversal of 90889291 is 19298809.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90889291 is a prime.

It is a super-4 number, since 4×90889291⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90889231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468405 + ... + 468598.

It is an arithmetic number, because the mean of its divisors is an integer number (22956598).

Almost surely, 2^90889291 is an apocalyptic number.

90889291 is a deficient number, since it is larger than the sum of its proper divisors (937101).

90889291 is an equidigital number, since it uses as much as digits as its factorization.

90889291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937100.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 90889291 is about 9533.5875199213. The cubic root of 90889291 is about 449.6116666251.

The spelling of 90889291 in words is "ninety million, eight hundred eighty-nine thousand, two hundred ninety-one".