814618821 has 4 divisors (see below), whose sum is σ = 1086158432. Its totient is φ = 543079212.

The previous prime is 814618799. The next prime is 814618829. The reversal of 814618821 is 128816418.

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 not a de Polignac number, because 814618821 - 2⁶ = 814618757 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 814618821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (814618829) 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, 135769801 + ... + 135769806.

It is an arithmetic number, because the mean of its divisors is an integer number (271539608).

Almost surely, 2^814618821 is an apocalyptic number.

It is an amenable number.

814618821 is a deficient number, since it is larger than the sum of its proper divisors (271539611).

814618821 is a wasteful number, since it uses less digits than its factorization.

814618821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271539610.

The product of its digits is 24576, while the sum is 39.

The square root of 814618821 is about 28541.5280074491. The cubic root of 814618821 is about 933.9382157071.

The spelling of 814618821 in words is "eight hundred fourteen million, six hundred eighteen thousand, eight hundred twenty-one".