51284513 has 4 divisors (see below), whose sum is σ = 58610880. Its totient is φ = 43958148.

The previous prime is 51284491. The next prime is 51284573. The reversal of 51284513 is 31548215.

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 51284513 - 2¹⁸ = 51022369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51284573) 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, 3663173 + ... + 3663186.

It is an arithmetic number, because the mean of its divisors is an integer number (14652720).

Almost surely, 2^51284513 is an apocalyptic number.

It is an amenable number.

51284513 is a deficient number, since it is larger than the sum of its proper divisors (7326367).

51284513 is an equidigital number, since it uses as much as digits as its factorization.

51284513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7326366.

The product of its digits is 4800, while the sum is 29.

The square root of 51284513 is about 7161.3206184334. The cubic root of 51284513 is about 371.5313040638.

The spelling of 51284513 in words is "fifty-one million, two hundred eighty-four thousand, five hundred thirteen".