816161247 has 12 divisors (see below), whose sum is σ = 1286072424. Its totient is φ = 494643120.

The previous prime is 816161221. The next prime is 816161249. The reversal of 816161247 is 742161618.

It is a happy number.

It is not a de Polignac number, because 816161247 - 2⁶ = 816161183 is a prime.

It is a super-2 number, since 2×816161247² = 1332238362209190018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816161249) 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, 4121928 + ... + 4122125.

It is an arithmetic number, because the mean of its divisors is an integer number (107172702).

Almost surely, 2^816161247 is an apocalyptic number.

816161247 is a deficient number, since it is larger than the sum of its proper divisors (469911177).

816161247 is a wasteful number, since it uses less digits than its factorization.

816161247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8244070 (or 8244067 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 816161247 is about 28568.5359617885. The cubic root of 816161247 is about 934.5272938222.

The spelling of 816161247 in words is "eight hundred sixteen million, one hundred sixty-one thousand, two hundred forty-seven".