2257509 has 4 divisors (see below), whose sum is σ = 3010016. Its totient is φ = 1505004.

The previous prime is 2257487. The next prime is 2257511. The reversal of 2257509 is 9057522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2257509 - 2¹⁵ = 2224741 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2257529) 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, 376249 + ... + 376254.

It is an arithmetic number, because the mean of its divisors is an integer number (752504).

2^2257509 is an apocalyptic number.

It is an amenable number.

2257509 is a deficient number, since it is larger than the sum of its proper divisors (752507).

2257509 is an equidigital number, since it uses as much as digits as its factorization.

2257509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752506.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 2257509 is about 1502.5009151412. The cubic root of 2257509 is about 131.1826793080.

The spelling of 2257509 in words is "two million, two hundred fifty-seven thousand, five hundred nine".