161564841 has 16 divisors (see below), whose sum is σ = 242637120. Its totient is φ = 106233120.

The previous prime is 161564827. The next prime is 161564861. The reversal of 161564841 is 148465161.

161564841 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 648 + 4 + 1 = 666.

It is not a de Polignac number, because 161564841 - 2¹⁰ = 161563817 is a prime.

It is a super-2 number, since 2×161564841² = 52206395694710562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161564796 and 161564805.

It is not an unprimeable number, because it can be changed into a prime (161564861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39015 + ... + 42956.

It is an arithmetic number, because the mean of its divisors is an integer number (15164820).

Almost surely, 2^161564841 is an apocalyptic number.

It is an amenable number.

161564841 is a deficient number, since it is larger than the sum of its proper divisors (81072279).

161564841 is an equidigital number, since it uses as much as digits as its factorization.

161564841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82053 (or 82047 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 161564841 is about 12710.8159061486. The cubic root of 161564841 is about 544.6476312724.

The spelling of 161564841 in words is "one hundred sixty-one million, five hundred sixty-four thousand, eight hundred forty-one".