8161685 has 16 divisors (see below), whose sum is σ = 11424000. Its totient is φ = 5595408.

The previous prime is 8161669. The next prime is 8161687. The reversal of 8161685 is 5861618.

8161685 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8161685 - 2⁴ = 8161669 is a prime.

It is a super-2 number, since 2×8161685² = 133226204078450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

8161685 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 665 + ... + 4094.

It is an arithmetic number, because the mean of its divisors is an integer number (714000).

Almost surely, 2^8161685 is an apocalyptic number.

It is an amenable number.

8161685 is a deficient number, since it is larger than the sum of its proper divisors (3262315).

8161685 is an equidigital number, since it uses as much as digits as its factorization.

8161685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4785 (or 4771 counting only the distinct ones).

The product of its digits is 11520, while the sum is 35.

The square root of 8161685 is about 2856.8662901858. The cubic root of 8161685 is about 201.3383984686.

The spelling of 8161685 in words is "eight million, one hundred sixty-one thousand, six hundred eighty-five".