90193009 has 3 divisors (see below), whose sum is σ = 90202507. Its totient is φ = 90183512.

The previous prime is 90193003. The next prime is 90193039. The reversal of 90193009 is 90039109.

The square root of 90193009 is 9497.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4223025 + 85969984 = 2055^2 + 9272^2 .

It is not a de Polignac number, because 90193009 - 2³ = 90193001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90193001) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4749 + ... + 14245.

Almost surely, 2^90193009 is an apocalyptic number.

90193009 is the 9497-th square number.

90193009 is the 4749-th centered octagonal number.

It is an amenable number.

90193009 is a deficient number, since it is larger than the sum of its proper divisors (9498).

90193009 is an frugal number, since it uses more digits than its factorization.

90193009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18994 (or 9497 counting only the distinct ones).

The product of its (nonzero) digits is 2187, while the sum is 31.

The cubic root of 90193009 is about 448.4605983133.

The spelling of 90193009 in words is "ninety million, one hundred ninety-three thousand, nine".