90690193 has 4 divisors (see below), whose sum is σ = 98934768. Its totient is φ = 82445620.

The previous prime is 90690181. The next prime is 90690203. The reversal of 90690193 is 39109609.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90690193 - 2¹³ = 90682001 is a prime.

It is a super-2 number, since 2×90690193² = 16449422212754498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90690143) 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, 4122271 + ... + 4122292.

It is an arithmetic number, because the mean of its divisors is an integer number (24733692).

Almost surely, 2^90690193 is an apocalyptic number.

It is an amenable number.

90690193 is a deficient number, since it is larger than the sum of its proper divisors (8244575).

90690193 is a wasteful number, since it uses less digits than its factorization.

90690193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8244574.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 90690193 is about 9523.1398708619. The cubic root of 90690193 is about 449.2831269036.

The spelling of 90690193 in words is "ninety million, six hundred ninety thousand, one hundred ninety-three".