2550891 has 32 divisors (see below), whose sum is σ = 4134400. Its totient is φ = 1397088.

The previous prime is 2550887. The next prime is 2550937. The reversal of 2550891 is 1980552.

It is not a de Polignac number, because 2550891 - 2² = 2550887 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 (2550871) 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 31 ways as a sum of consecutive naturals, for example, 38040 + ... + 38106.

It is an arithmetic number, because the mean of its divisors is an integer number (129200).

2^2550891 is an apocalyptic number.

2550891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2550891 is a deficient number, since it is larger than the sum of its proper divisors (1583509).

2550891 is an equidigital number, since it uses as much as digits as its factorization.

2550891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 2550891 is about 1597.1509008231. The cubic root of 2550891 is about 136.6356311310.

The spelling of 2550891 in words is "two million, five hundred fifty thousand, eight hundred ninety-one".