90661111 has 16 divisors (see below), whose sum is σ = 95385600. Its totient is φ = 86100768.

The previous prime is 90661093. The next prime is 90661121. The reversal of 90661111 is 11116609.

It is a cyclic number.

It is not a de Polignac number, because 90661111 - 2⁹ = 90660599 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 (90661121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246850 + ... + 247216.

It is an arithmetic number, because the mean of its divisors is an integer number (5961600).

Almost surely, 2^90661111 is an apocalyptic number.

90661111 is a deficient number, since it is larger than the sum of its proper divisors (4724489).

90661111 is a wasteful number, since it uses less digits than its factorization.

90661111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 90661111 is about 9521.6128360693. The cubic root of 90661111 is about 449.2350972752.

The spelling of 90661111 in words is "ninety million, six hundred sixty-one thousand, one hundred eleven".