90103661 has 4 divisors (see below), whose sum is σ = 90134172. Its totient is φ = 90073152.

The previous prime is 90103631. The next prime is 90103669. The reversal of 90103661 is 16630109.

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 68989636 + 21114025 = 8306^2 + 4595^2 .

It is a cyclic number.

It is not a de Polignac number, because 90103661 - 2⁶ = 90103597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90103661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90103669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10286 + ... + 16911.

It is an arithmetic number, because the mean of its divisors is an integer number (22533543).

Almost surely, 2^90103661 is an apocalyptic number.

It is an amenable number.

90103661 is a deficient number, since it is larger than the sum of its proper divisors (30511).

90103661 is a wasteful number, since it uses less digits than its factorization.

90103661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30510.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 90103661 is about 9492.2948226443. The cubic root of 90103661 is about 448.3124630476.

The spelling of 90103661 in words is "ninety million, one hundred three thousand, six hundred sixty-one".