251863 has 4 divisors (see below), whose sum is σ = 258048. Its totient is φ = 245680.

The previous prime is 251861. The next prime is 251879. The reversal of 251863 is 368152.

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 251863 - 2¹ = 251861 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 (251861) 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, 3031 + ... + 3112.

It is an arithmetic number, because the mean of its divisors is an integer number (64512).

2²⁵¹⁸⁶³ is an apocalyptic number.

251863 is a deficient number, since it is larger than the sum of its proper divisors (6185).

251863 is an equidigital number, since it uses as much as digits as its factorization.

251863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6184.

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

The square root of 251863 is about 501.8595421032. The cubic root of 251863 is about 63.1521475886.

The spelling of 251863 in words is "two hundred fifty-one thousand, eight hundred sixty-three".