91331226 has 80 divisors (see below), whose sum is σ = 239452224. Its totient is φ = 25474176.

The previous prime is 91331203. The next prime is 91331257. The reversal of 91331226 is 62213319.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 91331226.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 47826 + ... + 49698.

Almost surely, 2^91331226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91331226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119726112).

91331226 is an abundant number, since it is smaller than the sum of its proper divisors (148120998).

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

91331226 is a wasteful number, since it uses less digits than its factorization.

91331226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1928 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 91331226 is about 9556.7372047158. The cubic root of 91331226 is about 450.3392109046.

The spelling of 91331226 in words is "ninety-one million, three hundred thirty-one thousand, two hundred twenty-six".