2609161 has 4 divisors (see below), whose sum is σ = 2612500. Its totient is φ = 2605824.

The previous prime is 2609147. The next prime is 2609171. The reversal of 2609161 is 1619062.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1742400 + 866761 = 1320^2 + 931^2 .

It is a cyclic number.

It is not a de Polignac number, because 2609161 - 2⁹ = 2608649 is a prime.

It is a super-2 number, since 2×2609161² = 13615442247842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2609171) 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, 205 + ... + 2293.

It is an arithmetic number, because the mean of its divisors is an integer number (653125).

2^2609161 is an apocalyptic number.

It is an amenable number.

2609161 is a deficient number, since it is larger than the sum of its proper divisors (3339).

2609161 is a wasteful number, since it uses less digits than its factorization.

2609161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2609161 is about 1615.2897572881. The cubic root of 2609161 is about 137.6681974736.

Subtracting from 2609161 its reverse (1619062), we obtain a palindrome (990099).

The spelling of 2609161 in words is "two million, six hundred nine thousand, one hundred sixty-one".