2605691 has 4 divisors (see below), whose sum is σ = 2842584. Its totient is φ = 2368800.

The previous prime is 2605663. The next prime is 2605741. The reversal of 2605691 is 1965062.

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

It is a cyclic number.

It is not a de Polignac number, because 2605691 - 2⁶ = 2605627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2605661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118430 + ... + 118451.

It is an arithmetic number, because the mean of its divisors is an integer number (710646).

2^2605691 is an apocalyptic number.

2605691 is a deficient number, since it is larger than the sum of its proper divisors (236893).

2605691 is a wasteful number, since it uses less digits than its factorization.

2605691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236892.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 2605691 is about 1614.2152892350. The cubic root of 2605691 is about 137.6071407361.

The spelling of 2605691 in words is "two million, six hundred five thousand, six hundred ninety-one".