816177969 has 12 divisors (see below), whose sum is σ = 1206341136. Its totient is φ = 531464472.

The previous prime is 816177961. The next prime is 816177997. The reversal of 816177969 is 969771618.

It is not a de Polignac number, because 816177969 - 2³ = 816177961 is a prime.

It is a super-2 number, since 2×816177969² = 1332292954161929922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (816177961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1054107 + ... + 1054880.

It is an arithmetic number, because the mean of its divisors is an integer number (100528428).

Almost surely, 2^816177969 is an apocalyptic number.

It is an amenable number.

816177969 is a deficient number, since it is larger than the sum of its proper divisors (390163167).

816177969 is a wasteful number, since it uses less digits than its factorization.

816177969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109036 (or 2109033 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 816177969 is about 28568.8286249192. The cubic root of 816177969 is about 934.5336761634.

The spelling of 816177969 in words is "eight hundred sixteen million, one hundred seventy-seven thousand, nine hundred sixty-nine".