91382231 has 4 divisors (see below), whose sum is σ = 91860864. Its totient is φ = 90903600.

The previous prime is 91382227. The next prime is 91382257. The reversal of 91382231 is 13228319.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91382231 - 2² = 91382227 is a prime.

It is a super-2 number, since 2×91382231² = 16701424285074722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91382194 and 91382203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91382281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239030 + ... + 239411.

It is an arithmetic number, because the mean of its divisors is an integer number (22965216).

Almost surely, 2^91382231 is an apocalyptic number.

91382231 is a deficient number, since it is larger than the sum of its proper divisors (478633).

91382231 is a wasteful number, since it uses less digits than its factorization.

91382231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478632.

The product of its digits is 2592, while the sum is 29.

The square root of 91382231 is about 9559.4053685363. The cubic root of 91382231 is about 450.4230277177.

The spelling of 91382231 in words is "ninety-one million, three hundred eighty-two thousand, two hundred thirty-one".