251449 has 4 divisors (see below), whose sum is σ = 274320. Its totient is φ = 228580.

The previous prime is 251443. The next prime is 251467. The reversal of 251449 is 944152.

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 251449 - 2⁵ = 251417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251443) 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 3 ways as a sum of consecutive naturals, for example, 11419 + ... + 11440.

It is an arithmetic number, because the mean of its divisors is an integer number (68580).

2²⁵¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

251449 is a deficient number, since it is larger than the sum of its proper divisors (22871).

251449 is a wasteful number, since it uses less digits than its factorization.

251449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22870.

The product of its digits is 1440, while the sum is 25.

The square root of 251449 is about 501.4469064617. The cubic root of 251449 is about 63.1175264818.

The spelling of 251449 in words is "two hundred fifty-one thousand, four hundred forty-nine".