251479 has 4 divisors (see below), whose sum is σ = 252976. Its totient is φ = 249984.

The previous prime is 251477. The next prime is 251483. The reversal of 251479 is 974152.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251479 - 2¹ = 251477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251473) 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, 459 + ... + 844.

It is an arithmetic number, because the mean of its divisors is an integer number (63244).

2²⁵¹⁴⁷⁹ is an apocalyptic number.

251479 is a deficient number, since it is larger than the sum of its proper divisors (1497).

251479 is a wasteful number, since it uses less digits than its factorization.

251479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496.

The product of its digits is 2520, while the sum is 28.

The square root of 251479 is about 501.4768190056. The cubic root of 251479 is about 63.1200365342.

The spelling of 251479 in words is "two hundred fifty-one thousand, four hundred seventy-nine".