251422427 has 4 divisors (see below), whose sum is σ = 251965920. Its totient is φ = 250878936.

The previous prime is 251422403. The next prime is 251422441. The reversal of 251422427 is 724224152.

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 251422427 - 2¹² = 251418331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251422427.

It is not an unprimeable number, because it can be changed into a prime (251422487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271052 + ... + 271977.

It is an arithmetic number, because the mean of its divisors is an integer number (62991480).

Almost surely, 2^251422427 is an apocalyptic number.

251422427 is a deficient number, since it is larger than the sum of its proper divisors (543493).

251422427 is an equidigital number, since it uses as much as digits as its factorization.

251422427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543492.

The product of its digits is 8960, while the sum is 29.

The square root of 251422427 is about 15856.3055911521. The cubic root of 251422427 is about 631.1530299434.

Adding to 251422427 its reverse (724224152), we get a palindrome (975646579).

The spelling of 251422427 in words is "two hundred fifty-one million, four hundred twenty-two thousand, four hundred twenty-seven".