90211693 has 12 divisors (see below), whose sum is σ = 106567488. Its totient is φ = 75700560.

The previous prime is 90211679. The next prime is 90211697. The reversal of 90211693 is 39611209.

It is not a de Polignac number, because 90211693 - 2⁹ = 90211181 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 (90211697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22405 + ... + 26122.

It is an arithmetic number, because the mean of its divisors is an integer number (8880624).

Almost surely, 2^90211693 is an apocalyptic number.

It is an amenable number.

90211693 is a deficient number, since it is larger than the sum of its proper divisors (16355795).

90211693 is a wasteful number, since it uses less digits than its factorization.

90211693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48564 (or 48551 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 90211693 is about 9497.9836281181. The cubic root of 90211693 is about 448.4915632383.

It can be divided in two parts, 902116 and 93, that added together give a palindrome (902209).

The spelling of 90211693 in words is "ninety million, two hundred eleven thousand, six hundred ninety-three".