2591161 has 4 divisors (see below), whose sum is σ = 2617972. Its totient is φ = 2564352.

The previous prime is 2591153. The next prime is 2591167. The reversal of 2591161 is 1611952.

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 2013561 + 577600 = 1419^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 2591161 - 2³ = 2591153 is a prime.

It is a super-3 number, since 3×2591161³ = 52192061361633318843, which contains 333 as substring.

It is a Duffinian number.

2591161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2591167) 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, 13260 + ... + 13453.

It is an arithmetic number, because the mean of its divisors is an integer number (654493).

2^2591161 is an apocalyptic number.

It is an amenable number.

2591161 is a deficient number, since it is larger than the sum of its proper divisors (26811).

2591161 is an equidigital number, since it uses as much as digits as its factorization.

2591161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26810.

The product of its digits is 540, while the sum is 25.

The square root of 2591161 is about 1609.7083586787. The cubic root of 2591161 is about 137.3508862840.

The spelling of 2591161 in words is "two million, five hundred ninety-one thousand, one hundred sixty-one".