97183991 has 4 divisors (see below), whose sum is σ = 97295184. Its totient is φ = 97072800.

The previous prime is 97183967. The next prime is 97183997. The reversal of 97183991 is 19938179.

It is a happy number.

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 97183991 - 2²⁶ = 30075127 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 (97183997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54275 + ... + 56036.

It is an arithmetic number, because the mean of its divisors is an integer number (24323796).

Almost surely, 2^97183991 is an apocalyptic number.

97183991 is a deficient number, since it is larger than the sum of its proper divisors (111193).

97183991 is a wasteful number, since it uses less digits than its factorization.

97183991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111192.

The product of its digits is 122472, while the sum is 47.

The square root of 97183991 is about 9858.1941043986. The cubic root of 97183991 is about 459.7604155652.

The spelling of 97183991 in words is "ninety-seven million, one hundred eighty-three thousand, nine hundred ninety-one".