251345423 has 4 divisors (see below), whose sum is σ = 287251920. Its totient is φ = 215438928.

The previous prime is 251345417. The next prime is 251345443. The reversal of 251345423 is 324543152.

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 251345423 - 2¹⁰ = 251344399 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 (251345443) 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, 17953238 + ... + 17953251.

It is an arithmetic number, because the mean of its divisors is an integer number (71812980).

Almost surely, 2^251345423 is an apocalyptic number.

251345423 is a deficient number, since it is larger than the sum of its proper divisors (35906497).

251345423 is an equidigital number, since it uses as much as digits as its factorization.

251345423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35906496.

The product of its digits is 14400, while the sum is 29.

The square root of 251345423 is about 15853.8772229382. The cubic root of 251345423 is about 631.0885882372.

Adding to 251345423 its reverse (324543152), we get a palindrome (575888575).

The spelling of 251345423 in words is "two hundred fifty-one million, three hundred forty-five thousand, four hundred twenty-three".