2251787 has 4 divisors (see below), whose sum is σ = 2258520. Its totient is φ = 2245056.

The previous prime is 2251771. The next prime is 2251807. The reversal of 2251787 is 7871522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7871522 = 2 ⋅3935761.

It is a cyclic number.

It is not a de Polignac number, because 2251787 - 2⁴ = 2251771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2251727) 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, 2837 + ... + 3542.

It is an arithmetic number, because the mean of its divisors is an integer number (564630).

2^2251787 is an apocalyptic number.

2251787 is a deficient number, since it is larger than the sum of its proper divisors (6733).

2251787 is an equidigital number, since it uses as much as digits as its factorization.

2251787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6732.

The product of its digits is 7840, while the sum is 32.

The square root of 2251787 is about 1500.5955484407. The cubic root of 2251787 is about 131.0717513813.

The spelling of 2251787 in words is "two million, two hundred fifty-one thousand, seven hundred eighty-seven".