91818697 has 4 divisors (see below), whose sum is σ = 96651280. Its totient is φ = 86986116.

The previous prime is 91818679. The next prime is 91818709. The reversal of 91818697 is 79681819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91818697 - 2⁷ = 91818569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91818697.

It is not an unprimeable number, because it can be changed into a prime (91818607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2416263 + ... + 2416300.

It is an arithmetic number, because the mean of its divisors is an integer number (24162820).

Almost surely, 2^91818697 is an apocalyptic number.

It is an amenable number.

91818697 is a deficient number, since it is larger than the sum of its proper divisors (4832583).

91818697 is a wasteful number, since it uses less digits than its factorization.

91818697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832582.

The product of its digits is 217728, while the sum is 49.

The square root of 91818697 is about 9582.2073135578. The cubic root of 91818697 is about 451.1390026843.

The spelling of 91818697 in words is "ninety-one million, eight hundred eighteen thousand, six hundred ninety-seven".