90434991 has 8 divisors (see below), whose sum is σ = 120623920. Its totient is φ = 60268032.

The previous prime is 90434987. The next prime is 90434999. The reversal of 90434991 is 19943409.

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

It is not a de Polignac number, because 90434991 - 2² = 90434987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90434999) 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, 13455 + ... + 19023.

It is an arithmetic number, because the mean of its divisors is an integer number (15077990).

Almost surely, 2^90434991 is an apocalyptic number.

90434991 is a deficient number, since it is larger than the sum of its proper divisors (30188929).

90434991 is a wasteful number, since it uses less digits than its factorization.

90434991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 90434991 is about 9509.7313842190. The cubic root of 90434991 is about 448.8613037483.

The spelling of 90434991 in words is "ninety million, four hundred thirty-four thousand, nine hundred ninety-one".