90909107 has 4 divisors (see below), whose sum is σ = 91306320. Its totient is φ = 90511896.

The previous prime is 90909101. The next prime is 90909109. The reversal of 90909107 is 70190909.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70190909 = 17 ⋅4128877.

It is a cyclic number.

It is not a de Polignac number, because 90909107 - 2¹² = 90905011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90909101) 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, 198263 + ... + 198720.

It is an arithmetic number, because the mean of its divisors is an integer number (22826580).

Almost surely, 2^90909107 is an apocalyptic number.

90909107 is a deficient number, since it is larger than the sum of its proper divisors (397213).

90909107 is a wasteful number, since it uses less digits than its factorization.

90909107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397212.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 90909107 is about 9534.6267362703. The cubic root of 90909107 is about 449.6443395516.

The spelling of 90909107 in words is "ninety million, nine hundred nine thousand, one hundred seven".