8161641 has 12 divisors (see below), whose sum is σ = 12226032. Its totient is φ = 5440932.

The previous prime is 8161631. The next prime is 8161661. The reversal of 8161641 is 1461618.

8161641 is a `hidden beast` number, since 8 + 1 + 616 + 41 = 666.

It is not a de Polignac number, because 8161641 - 2¹⁰ = 8160617 is a prime.

It is a super-2 number, since 2×8161641² = 133224767625762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (8161631) 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, 16551 + ... + 17036.

It is an arithmetic number, because the mean of its divisors is an integer number (1018836).

Almost surely, 2^8161641 is an apocalyptic number.

8161641 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8161641 is a deficient number, since it is larger than the sum of its proper divisors (4064391).

8161641 is an equidigital number, since it uses as much as digits as its factorization.

8161641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33602 (or 33590 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 8161641 is about 2856.8585894300. The cubic root of 8161641 is about 201.3380366600.

The spelling of 8161641 in words is "eight million, one hundred sixty-one thousand, six hundred forty-one".