91827397 has 8 divisors (see below), whose sum is σ = 92678040. Its totient is φ = 90981120.

The previous prime is 91827389. The next prime is 91827409. The reversal of 91827397 is 79372819.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30846916 + 60980481 = 5554^2 + 7809^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91827397 - 2³ = 91827389 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 (91827347) 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, 52497 + ... + 54217.

It is an arithmetic number, because the mean of its divisors is an integer number (11584755).

Almost surely, 2^91827397 is an apocalyptic number.

It is an amenable number.

91827397 is a deficient number, since it is larger than the sum of its proper divisors (850643).

91827397 is a wasteful number, since it uses less digits than its factorization.

91827397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183.

The product of its digits is 190512, while the sum is 46.

The square root of 91827397 is about 9582.6612691882. The cubic root of 91827397 is about 451.1532510001.

The spelling of 91827397 in words is "ninety-one million, eight hundred twenty-seven thousand, three hundred ninety-seven".