251143 has 2 divisors, whose sum is σ = 251144. Its totient is φ = 251142.

The previous prime is 251117. The next prime is 251149. The reversal of 251143 is 341152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251143 is a prime.

251143 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125571 + 125572.

It is an arithmetic number, because the mean of its divisors is an integer number (125572).

2²⁵¹¹⁴³ is an apocalyptic number.

251143 is a deficient number, since it is larger than the sum of its proper divisors (1).

251143 is an equidigital number, since it uses as much as digits as its factorization.

251143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 16.

The square root of 251143 is about 501.1416965290. The cubic root of 251143 is about 63.0919125361.

Adding to 251143 its reverse (341152), we get a palindrome (592295).

Subtracting 251143 from its reverse (341152), we obtain a palindrome (90009).

The spelling of 251143 in words is "two hundred fifty-one thousand, one hundred forty-three".