51427231 has 4 divisors (see below), whose sum is σ = 51640864. Its totient is φ = 51213600.

The previous prime is 51427213. The next prime is 51427247. The reversal of 51427231 is 13272415.

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 51427231 - 2⁵ = 51427199 is a prime.

It is a super-2 number, since 2×51427231² = 5289520176654722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51427196 and 51427205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55427231) 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, 106455 + ... + 106936.

It is an arithmetic number, because the mean of its divisors is an integer number (12910216).

Almost surely, 2^51427231 is an apocalyptic number.

51427231 is a deficient number, since it is larger than the sum of its proper divisors (213633).

51427231 is a wasteful number, since it uses less digits than its factorization.

51427231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213632.

The product of its digits is 1680, while the sum is 25.

The square root of 51427231 is about 7171.2781984804. The cubic root of 51427231 is about 371.8756256469.

Adding to 51427231 its reverse (13272415), we get a palindrome (64699646).

The spelling of 51427231 in words is "fifty-one million, four hundred twenty-seven thousand, two hundred thirty-one".