818891601 has 16 divisors (see below), whose sum is σ = 1192666368. Its totient is φ = 495651600.

The previous prime is 818891599. The next prime is 818891639. The reversal of 818891601 is 106198818.

818891601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 818891601 - 2¹ = 818891599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (818893601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10206 + ... + 41736.

It is an arithmetic number, because the mean of its divisors is an integer number (74541648).

Almost surely, 2^818891601 is an apocalyptic number.

It is an amenable number.

818891601 is a deficient number, since it is larger than the sum of its proper divisors (373774767).

818891601 is a wasteful number, since it uses less digits than its factorization.

818891601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32332.

The product of its (nonzero) digits is 27648, while the sum is 42.

The square root of 818891601 is about 28616.2820960376. The cubic root of 818891601 is about 935.5682442840.

The spelling of 818891601 in words is "eight hundred eighteen million, eight hundred ninety-one thousand, six hundred one".