2551191 has 4 divisors (see below), whose sum is σ = 3401592. Its totient is φ = 1700792.

The previous prime is 2551177. The next prime is 2551223. The reversal of 2551191 is 1911552.

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 2551191 - 2⁶ = 2551127 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2552191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425196 + ... + 425201.

It is an arithmetic number, because the mean of its divisors is an integer number (850398).

2^2551191 is an apocalyptic number.

2551191 is a deficient number, since it is larger than the sum of its proper divisors (850401).

2551191 is an equidigital number, since it uses as much as digits as its factorization.

2551191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850400.

The product of its digits is 450, while the sum is 24.

The square root of 2551191 is about 1597.2448152991. The cubic root of 2551191 is about 136.6409873095.

The spelling of 2551191 in words is "two million, five hundred fifty-one thousand, one hundred ninety-one".