251242423 has 4 divisors (see below), whose sum is σ = 251276688. Its totient is φ = 251208160.

The previous prime is 251242417. The next prime is 251242427. The reversal of 251242423 is 324242152.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 251242423 - 2⁵ = 251242391 is a prime.

It is a super-2 number, since 2×251242423² = 126245510229821858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251242427) 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, 1186 + ... + 22447.

It is an arithmetic number, because the mean of its divisors is an integer number (62819172).

Almost surely, 2^251242423 is an apocalyptic number.

251242423 is a deficient number, since it is larger than the sum of its proper divisors (34265).

251242423 is a wasteful number, since it uses less digits than its factorization.

251242423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34264.

The product of its digits is 3840, while the sum is 25.

The square root of 251242423 is about 15850.6284733445. The cubic root of 251242423 is about 631.0023708913.

Adding to 251242423 its reverse (324242152), we get a palindrome (575484575).

The spelling of 251242423 in words is "two hundred fifty-one million, two hundred forty-two thousand, four hundred twenty-three".