818460991 has 4 divisors (see below), whose sum is σ = 818695800. Its totient is φ = 818226184.

The previous prime is 818460953. The next prime is 818461001. The reversal of 818460991 is 199064818.

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 818460991 - 2¹⁹ = 817936703 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 (818460691) 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, 112096 + ... + 119173.

It is an arithmetic number, because the mean of its divisors is an integer number (204673950).

Almost surely, 2^818460991 is an apocalyptic number.

818460991 is a deficient number, since it is larger than the sum of its proper divisors (234809).

818460991 is a wasteful number, since it uses less digits than its factorization.

818460991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234808.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 818460991 is about 28608.7572431939. The cubic root of 818460991 is about 935.4042275910.

The spelling of 818460991 in words is "eight hundred eighteen million, four hundred sixty thousand, nine hundred ninety-one".