251423 has 4 divisors (see below), whose sum is σ = 253968. Its totient is φ = 248880.

The previous prime is 251417. The next prime is 251429. The reversal of 251423 is 324152.

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

It is an interprime number because it is at equal distance from previous prime (251417) and next prime (251429).

It is a cyclic number.

It is not a de Polignac number, because 251423 - 2⁶ = 251359 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 251423.

It is not an unprimeable number, because it can be changed into a prime (251429) 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, 1118 + ... + 1323.

It is an arithmetic number, because the mean of its divisors is an integer number (63492).

2²⁵¹⁴²³ is an apocalyptic number.

251423 is a deficient number, since it is larger than the sum of its proper divisors (2545).

251423 is a wasteful number, since it uses less digits than its factorization.

251423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544.

The product of its digits is 240, while the sum is 17.

The square root of 251423 is about 501.4209808135. The cubic root of 251423 is about 63.1153509416.

Adding to 251423 its reverse (324152), we get a palindrome (575575).

The spelling of 251423 in words is "two hundred fifty-one thousand, four hundred twenty-three".