2658991 has 4 divisors (see below), whose sum is σ = 2720872. Its totient is φ = 2597112.

The previous prime is 2658989. The next prime is 2659001. The reversal of 2658991 is 1998562.

2658991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2658991 - 2¹ = 2658989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2658941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30876 + ... + 30961.

It is an arithmetic number, because the mean of its divisors is an integer number (680218).

2^2658991 is an apocalyptic number.

2658991 is a deficient number, since it is larger than the sum of its proper divisors (61881).

2658991 is an equidigital number, since it uses as much as digits as its factorization.

2658991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61880.

The product of its digits is 38880, while the sum is 40.

The square root of 2658991 is about 1630.6412848938. The cubic root of 2658991 is about 138.5390767589.

The spelling of 2658991 in words is "two million, six hundred fifty-eight thousand, nine hundred ninety-one".