91143208 has 32 divisors (see below), whose sum is σ = 185882760. Its totient is φ = 41644800.

The previous prime is 91143203. The next prime is 91143229. The reversal of 91143208 is 80234119.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 76073284 + 15069924 = 8722^2 + 3882^2 .

It is not an unprimeable number, because it can be changed into a prime (91143203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6166 + ... + 14842.

Almost surely, 2^91143208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91143208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92941380).

91143208 is an abundant number, since it is smaller than the sum of its proper divisors (94739552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91143208 is a wasteful number, since it uses less digits than its factorization.

91143208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8797 (or 8793 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 91143208 is about 9546.8952021063. The cubic root of 91143208 is about 450.0299700204.

The spelling of 91143208 in words is "ninety-one million, one hundred forty-three thousand, two hundred eight".