816164749 has 4 divisors (see below), whose sum is σ = 819667836. Its totient is φ = 812661664.

The previous prime is 816164743. The next prime is 816164753. The reversal of 816164749 is 947461618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 443944900 + 372219849 = 21070^2 + 19293^2 .

It is a cyclic number.

It is not a de Polignac number, because 816164749 - 2⁵ = 816164717 is a prime.

It is a super-2 number, since 2×816164749² = 1332249795020466002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 816164699 and 816164708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816164743) 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, 1751194 + ... + 1751659.

It is an arithmetic number, because the mean of its divisors is an integer number (204916959).

Almost surely, 2^816164749 is an apocalyptic number.

It is an amenable number.

816164749 is a deficient number, since it is larger than the sum of its proper divisors (3503087).

816164749 is a wasteful number, since it uses less digits than its factorization.

816164749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503086.

The product of its digits is 290304, while the sum is 46.

The square root of 816164749 is about 28568.5972529279. The cubic root of 816164749 is about 934.5286304494.

The spelling of 816164749 in words is "eight hundred sixteen million, one hundred sixty-four thousand, seven hundred forty-nine".