51493633 has 4 divisors (see below), whose sum is σ = 51755220. Its totient is φ = 51232048.

The previous prime is 51493609. The next prime is 51493639. The reversal of 51493633 is 33639415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22581504 + 28912129 = 4752^2 + 5377^2 .

It is a cyclic number.

It is not a de Polignac number, because 51493633 - 2⁹ = 51493121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51493639) 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, 130498 + ... + 130891.

It is an arithmetic number, because the mean of its divisors is an integer number (12938805).

Almost surely, 2^51493633 is an apocalyptic number.

It is an amenable number.

51493633 is a deficient number, since it is larger than the sum of its proper divisors (261587).

51493633 is a wasteful number, since it uses less digits than its factorization.

51493633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261586.

The product of its digits is 29160, while the sum is 34.

The square root of 51493633 is about 7175.9064235816. The cubic root of 51493633 is about 372.0356100531.

The spelling of 51493633 in words is "fifty-one million, four hundred ninety-three thousand, six hundred thirty-three".