818042281 has 4 divisors (see below), whose sum is σ = 934905472. Its totient is φ = 701179092.

The previous prime is 818042279. The next prime is 818042293. The reversal of 818042281 is 182240818.

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 818042281 - 2¹ = 818042279 is a prime.

It is a super-2 number, since 2×818042281² = 1338386347007365922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818042201) 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, 58431585 + ... + 58431598.

It is an arithmetic number, because the mean of its divisors is an integer number (233726368).

Almost surely, 2^818042281 is an apocalyptic number.

It is an amenable number.

818042281 is a deficient number, since it is larger than the sum of its proper divisors (116863191).

818042281 is a wasteful number, since it uses less digits than its factorization.

818042281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116863190.

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 818042281 is about 28601.4384428476. The cubic root of 818042281 is about 935.2446883595.

The spelling of 818042281 in words is "eight hundred eighteen million, forty-two thousand, two hundred eighty-one".