2655991 has 8 divisors (see below), whose sum is σ = 3011120. Its totient is φ = 2322432.

The previous prime is 2655977. The next prime is 2656009. The reversal of 2655991 is 1995562.

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 2655991 - 2⁹ = 2655479 is a prime.

2655991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2655991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2655911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5130 + ... + 5623.

It is an arithmetic number, because the mean of its divisors is an integer number (376390).

2^2655991 is an apocalyptic number.

2655991 is a deficient number, since it is larger than the sum of its proper divisors (355129).

2655991 is a wasteful number, since it uses less digits than its factorization.

2655991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10785.

The product of its digits is 24300, while the sum is 37.

The square root of 2655991 is about 1629.7211417908. The cubic root of 2655991 is about 138.4869550287.

The spelling of 2655991 in words is "two million, six hundred fifty-five thousand, nine hundred ninety-one".