2809161 has 20 divisors (see below), whose sum is σ = 4259200. Its totient is φ = 1844856.

The previous prime is 2809141. The next prime is 2809181. The reversal of 2809161 is 1619082.

It is an interprime number because it is at equal distance from previous prime (2809141) and next prime (2809181).

It is not a de Polignac number, because 2809161 - 2¹³ = 2800969 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2809141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6180 + ... + 6618.

It is an arithmetic number, because the mean of its divisors is an integer number (212960).

2^2809161 is an apocalyptic number.

It is an amenable number.

2809161 is a deficient number, since it is larger than the sum of its proper divisors (1450039).

2809161 is an equidigital number, since it uses as much as digits as its factorization.

2809161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2809161 is about 1676.0551900221. The cubic root of 2809161 is about 141.0995223133.

The spelling of 2809161 in words is "two million, eight hundred nine thousand, one hundred sixty-one".