2251555 has 4 divisors (see below), whose sum is σ = 2701872. Its totient is φ = 1801240.

The previous prime is 2251553. The next prime is 2251559. The reversal of 2251555 is 5551522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5551522 = 2 ⋅2775761.

It is not a de Polignac number, because 2251555 - 2¹ = 2251553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2251553) 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, 225151 + ... + 225160.

It is an arithmetic number, because the mean of its divisors is an integer number (675468).

2^2251555 is an apocalyptic number.

2251555 is a deficient number, since it is larger than the sum of its proper divisors (450317).

2251555 is an equidigital number, since it uses as much as digits as its factorization.

2251555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450316.

The product of its digits is 2500, while the sum is 25.

The square root of 2251555 is about 1500.5182438078. The cubic root of 2251555 is about 131.0672498172.

The spelling of 2251555 in words is "two million, two hundred fifty-one thousand, five hundred fifty-five".