91897383 has 4 divisors (see below), whose sum is σ = 122529848. Its totient is φ = 61264920.

The previous prime is 91897369. The next prime is 91897391. The reversal of 91897383 is 38379819.

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

It is not a de Polignac number, because 91897383 - 2¹² = 91893287 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 (91897313) 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, 15316228 + ... + 15316233.

It is an arithmetic number, because the mean of its divisors is an integer number (30632462).

Almost surely, 2^91897383 is an apocalyptic number.

91897383 is a deficient number, since it is larger than the sum of its proper divisors (30632465).

91897383 is a wasteful number, since it uses less digits than its factorization.

91897383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30632464.

The product of its digits is 326592, while the sum is 48.

The square root of 91897383 is about 9586.3122732363. The cubic root of 91897383 is about 451.2678369676.

The spelling of 91897383 in words is "ninety-one million, eight hundred ninety-seven thousand, three hundred eighty-three".