251963 has 4 divisors (see below), whose sum is σ = 253440. Its totient is φ = 250488.

The previous prime is 251947. The next prime is 251969. The reversal of 251963 is 369152.

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 251963 - 2⁴ = 251947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251969) 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, 443 + ... + 836.

It is an arithmetic number, because the mean of its divisors is an integer number (63360).

2²⁵¹⁹⁶³ is an apocalyptic number.

251963 is a deficient number, since it is larger than the sum of its proper divisors (1477).

251963 is a wasteful number, since it uses less digits than its factorization.

251963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476.

The product of its digits is 1620, while the sum is 26.

The square root of 251963 is about 501.9591616855. The cubic root of 251963 is about 63.1605044852.

The spelling of 251963 in words is "two hundred fifty-one thousand, nine hundred sixty-three".