90991196 has 6 divisors (see below), whose sum is σ = 159234600. Its totient is φ = 45495596.

The previous prime is 90991193. The next prime is 90991213. The reversal of 90991196 is 69119909.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90991193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11373896 + ... + 11373903.

It is an arithmetic number, because the mean of its divisors is an integer number (26539100).

Almost surely, 2^90991196 is an apocalyptic number.

It is an amenable number.

90991196 is a deficient number, since it is larger than the sum of its proper divisors (68243404).

90991196 is a wasteful number, since it uses less digits than its factorization.

90991196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22747803 (or 22747801 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 90991196 is about 9538.9305480227. The cubic root of 90991196 is about 449.7796386105.

The spelling of 90991196 in words is "ninety million, nine hundred ninety-one thousand, one hundred ninety-six".