90418091 has 4 divisors (see below), whose sum is σ = 90923400. Its totient is φ = 89912784.

The previous prime is 90418073. The next prime is 90418109. The reversal of 90418091 is 19081409.

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

It is an interprime number because it is at equal distance from previous prime (90418073) and next prime (90418109).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90418091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90418021) 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, 252386 + ... + 252743.

It is an arithmetic number, because the mean of its divisors is an integer number (22730850).

Almost surely, 2^90418091 is an apocalyptic number.

90418091 is a deficient number, since it is larger than the sum of its proper divisors (505309).

90418091 is a wasteful number, since it uses less digits than its factorization.

90418091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505308.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 90418091 is about 9508.8427792240. The cubic root of 90418091 is about 448.8333417522.

The spelling of 90418091 in words is "ninety million, four hundred eighteen thousand, ninety-one".