2251539 has 24 divisors (see below), whose sum is σ = 3463200. Its totient is φ = 1406592.

The previous prime is 2251517. The next prime is 2251547. The reversal of 2251539 is 9351522.

It is not a de Polignac number, because 2251539 - 2⁵ = 2251507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2251559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15037 + ... + 15185.

It is an arithmetic number, because the mean of its divisors is an integer number (144300).

2^2251539 is an apocalyptic number.

2251539 is a deficient number, since it is larger than the sum of its proper divisors (1211661).

2251539 is a wasteful number, since it uses less digits than its factorization.

2251539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 248 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 2251539 is about 1500.5129123070. The cubic root of 2251539 is about 131.0669393531.

It can be divided in two parts, 225 and 1539, that added together give a square (1764 = 42²).

The spelling of 2251539 in words is "two million, two hundred fifty-one thousand, five hundred thirty-nine".