90174391 has 4 divisors (see below), whose sum is σ = 90238752. Its totient is φ = 90110032.

The previous prime is 90174389. The next prime is 90174407. The reversal of 90174391 is 19347109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19347109 = 173 ⋅111833.

It is a cyclic number.

It is not a de Polignac number, because 90174391 - 2¹ = 90174389 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 (90178391) 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, 30031 + ... + 32896.

It is an arithmetic number, because the mean of its divisors is an integer number (22559688).

Almost surely, 2^90174391 is an apocalyptic number.

90174391 is a deficient number, since it is larger than the sum of its proper divisors (64361).

90174391 is a wasteful number, since it uses less digits than its factorization.

90174391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64360.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 90174391 is about 9496.0197451353. The cubic root of 90174391 is about 448.4297385157.

The spelling of 90174391 in words is "ninety million, one hundred seventy-four thousand, three hundred ninety-one".