64221161 has 4 divisors (see below), whose sum is σ = 64285572. Its totient is φ = 64156752.

The previous prime is 64221139. The next prime is 64221163. The reversal of 64221161 is 16112246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16112246 = 2 ⋅8056123.

It can be written as a sum of positive squares in 2 ways, for example, as 7595536 + 56625625 = 2756^2 + 7525^2 .

It is a cyclic number.

It is not a de Polignac number, because 64221161 - 2⁶ = 64221097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64221163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30686 + ... + 32711.

It is an arithmetic number, because the mean of its divisors is an integer number (16071393).

Almost surely, 2^64221161 is an apocalyptic number.

It is an amenable number.

64221161 is a deficient number, since it is larger than the sum of its proper divisors (64411).

64221161 is a wasteful number, since it uses less digits than its factorization.

64221161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64410.

The product of its digits is 576, while the sum is 23.

The square root of 64221161 is about 8013.8106416361. The cubic root of 64221161 is about 400.4602223687.

The spelling of 64221161 in words is "sixty-four million, two hundred twenty-one thousand, one hundred sixty-one".