2591605 has 8 divisors (see below), whose sum is σ = 3118752. Its totient is φ = 2067408.

The previous prime is 2591587. The next prime is 2591609. The reversal of 2591605 is 5061952.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2591605 - 2⁹ = 2591093 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591609) 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 7 ways as a sum of consecutive naturals, for example, 2494 + ... + 3376.

It is an arithmetic number, because the mean of its divisors is an integer number (389844).

2^2591605 is an apocalyptic number.

It is an amenable number.

2591605 is a deficient number, since it is larger than the sum of its proper divisors (527147).

2591605 is an equidigital number, since it uses as much as digits as its factorization.

2591605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 2591605 is about 1609.8462659521. The cubic root of 2591605 is about 137.3587309413.

The spelling of 2591605 in words is "two million, five hundred ninety-one thousand, six hundred five".