90415909 has 4 divisors (see below), whose sum is σ = 90526860. Its totient is φ = 90304960.

The previous prime is 90415891. The next prime is 90415951. The reversal of 90415909 is 90951409.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27531009 + 62884900 = 5247^2 + 7930^2 .

It is a cyclic number.

It is not a de Polignac number, because 90415909 - 2⁷ = 90415781 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 (90415709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54244 + ... + 55885.

It is an arithmetic number, because the mean of its divisors is an integer number (22631715).

Almost surely, 2^90415909 is an apocalyptic number.

It is an amenable number.

90415909 is a deficient number, since it is larger than the sum of its proper divisors (110951).

90415909 is a wasteful number, since it uses less digits than its factorization.

90415909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110950.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 90415909 is about 9508.7280432243. The cubic root of 90415909 is about 448.8297312571.

The spelling of 90415909 in words is "ninety million, four hundred fifteen thousand, nine hundred nine".