263251 has 4 divisors (see below), whose sum is σ = 268272. Its totient is φ = 258232.

The previous prime is 263239. The next prime is 263257. The reversal of 263251 is 152362.

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 263251 - 2⁹ = 262739 is a prime.

It is a d-powerful number, because it can be written as 2⁸ + 6³ + 2¹⁸ + 3² + 5⁴ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263257) 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, 2431 + ... + 2536.

It is an arithmetic number, because the mean of its divisors is an integer number (67068).

2²⁶³²⁵¹ is an apocalyptic number.

263251 is the 325-th centered pentagonal number.

263251 is a deficient number, since it is larger than the sum of its proper divisors (5021).

263251 is an equidigital number, since it uses as much as digits as its factorization.

263251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5020.

The product of its digits is 360, while the sum is 19.

The square root of 263251 is about 513.0799158026. The cubic root of 263251 is about 64.0899613775.

Subtracting from 263251 its reverse (152362), we obtain a square (110889 = 333²).

The spelling of 263251 in words is "two hundred sixty-three thousand, two hundred fifty-one".