2251491 has 8 divisors (see below), whose sum is σ = 3274944. Its totient is φ = 1364520.

The previous prime is 2251489. The next prime is 2251507. The reversal of 2251491 is 1941522.

2251491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2251491 - 2¹ = 2251489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2251411) 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 7 ways as a sum of consecutive naturals, for example, 34081 + ... + 34146.

It is an arithmetic number, because the mean of its divisors is an integer number (409368).

2^2251491 is an apocalyptic number.

2251491 is a deficient number, since it is larger than the sum of its proper divisors (1023453).

2251491 is a wasteful number, since it uses less digits than its factorization.

2251491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68241.

The product of its digits is 720, while the sum is 24.

The square root of 2251491 is about 1500.4969176909. The cubic root of 2251491 is about 131.0660079520.

The spelling of 2251491 in words is "two million, two hundred fifty-one thousand, four hundred ninety-one".