51555513 has 8 divisors (see below), whose sum is σ = 68891008. Its totient is φ = 34295184.

The previous prime is 51555499. The next prime is 51555521. The reversal of 51555513 is 31555515.

51555513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-51555513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51555613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17170 + ... + 19947.

It is an arithmetic number, because the mean of its divisors is an integer number (8611376).

Almost surely, 2^51555513 is an apocalyptic number.

It is an amenable number.

51555513 is a deficient number, since it is larger than the sum of its proper divisors (17335495).

51555513 is a wasteful number, since it uses less digits than its factorization.

51555513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37583.

The product of its digits is 9375, while the sum is 30.

The square root of 51555513 is about 7180.2167794573. The cubic root of 51555513 is about 372.1845757063.

The spelling of 51555513 in words is "fifty-one million, five hundred fifty-five thousand, five hundred thirteen".