2819161 has 4 divisors (see below), whose sum is σ = 2985012. Its totient is φ = 2653312.

The previous prime is 2819153. The next prime is 2819189. The reversal of 2819161 is 1619182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1089936 + 1729225 = 1044^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 2819161 - 2³ = 2819153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2819101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82900 + ... + 82933.

It is an arithmetic number, because the mean of its divisors is an integer number (746253).

2^2819161 is an apocalyptic number.

It is an amenable number.

2819161 is a deficient number, since it is larger than the sum of its proper divisors (165851).

2819161 is a wasteful number, since it uses less digits than its factorization.

2819161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165850.

The product of its digits is 864, while the sum is 28.

The square root of 2819161 is about 1679.0357351766. The cubic root of 2819161 is about 141.2667518702.

The spelling of 2819161 in words is "two million, eight hundred nineteen thousand, one hundred sixty-one".