90809601 has 4 divisors (see below), whose sum is σ = 121079472. Its totient is φ = 60539732.

The previous prime is 90809599. The next prime is 90809611. The reversal of 90809601 is 10690809.

It is a happy number.

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 90809601 - 2¹ = 90809599 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90809611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15134931 + ... + 15134936.

It is an arithmetic number, because the mean of its divisors is an integer number (30269868).

Almost surely, 2^90809601 is an apocalyptic number.

It is an amenable number.

90809601 is a deficient number, since it is larger than the sum of its proper divisors (30269871).

90809601 is a wasteful number, since it uses less digits than its factorization.

90809601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30269870.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 90809601 is about 9529.4071693889. The cubic root of 90809601 is about 449.4802245525.

It can be divided in two parts, 9080 and 9601, that added together give a palindrome (18681).

The spelling of 90809601 in words is "ninety million, eight hundred nine thousand, six hundred one".