2551091 has 4 divisors (see below), whose sum is σ = 2662032. Its totient is φ = 2440152.

The previous prime is 2551079. The next prime is 2551097. The reversal of 2551091 is 1901552.

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 2551091 - 2⁶ = 2551027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 110917 = 2551091 / (2 + 5 + 5 + 1 + 0 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551097) 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, 55436 + ... + 55481.

It is an arithmetic number, because the mean of its divisors is an integer number (665508).

2^2551091 is an apocalyptic number.

2551091 is a deficient number, since it is larger than the sum of its proper divisors (110941).

2551091 is a wasteful number, since it uses less digits than its factorization.

2551091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110940.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 2551091 is about 1597.2135110874. The cubic root of 2551091 is about 136.6392019633.

The spelling of 2551091 in words is "two million, five hundred fifty-one thousand, ninety-one".