816514689 has 4 divisors (see below), whose sum is σ = 1088686256. Its totient is φ = 544343124.

The previous prime is 816514679. The next prime is 816514703. The reversal of 816514689 is 986415618.

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 816514689 - 2⁷ = 816514561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (816514619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136085779 + ... + 136085784.

It is an arithmetic number, because the mean of its divisors is an integer number (272171564).

Almost surely, 2^816514689 is an apocalyptic number.

It is an amenable number.

816514689 is a deficient number, since it is larger than the sum of its proper divisors (272171567).

816514689 is a wasteful number, since it uses less digits than its factorization.

816514689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272171566.

The product of its digits is 414720, while the sum is 48.

The square root of 816514689 is about 28574.7211534951. The cubic root of 816514689 is about 934.6621746557.

The spelling of 816514689 in words is "eight hundred sixteen million, five hundred fourteen thousand, six hundred eighty-nine".