51627281 has 4 divisors (see below), whose sum is σ = 51684864. Its totient is φ = 51569700.

The previous prime is 51627271. The next prime is 51627293. The reversal of 51627281 is 18272615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51627281 - 2¹⁸ = 51365137 is a prime.

It is a super-2 number, since 2×51627281² = 5330752286905922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51627271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27425 + ... + 29246.

It is an arithmetic number, because the mean of its divisors is an integer number (12921216).

Almost surely, 2^51627281 is an apocalyptic number.

It is an amenable number.

51627281 is a deficient number, since it is larger than the sum of its proper divisors (57583).

51627281 is an equidigital number, since it uses as much as digits as its factorization.

51627281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57582.

The product of its digits is 6720, while the sum is 32.

The square root of 51627281 is about 7185.2126621277. The cubic root of 51627281 is about 372.3571958349.

Adding to 51627281 its reverse (18272615), we get a palindrome (69899896).

The spelling of 51627281 in words is "fifty-one million, six hundred twenty-seven thousand, two hundred eighty-one".