51505513 has 8 divisors (see below), whose sum is σ = 52744608. Its totient is φ = 50280384.

The previous prime is 51505511. The next prime is 51505543. The reversal of 51505513 is 31550515.

51505513 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 cyclic number.

It is not a de Polignac number, because 51505513 - 2¹ = 51505511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51505511) 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, 4170 + ... + 10972.

It is an arithmetic number, because the mean of its divisors is an integer number (6593076).

Almost surely, 2^51505513 is an apocalyptic number.

It is an amenable number.

51505513 is a deficient number, since it is larger than the sum of its proper divisors (1239095).

51505513 is a wasteful number, since it uses less digits than its factorization.

51505513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6983.

The product of its (nonzero) digits is 1875, while the sum is 25.

The square root of 51505513 is about 7176.7341458354. The cubic root of 51505513 is about 372.0642184004.

The spelling of 51505513 in words is "fifty-one million, five hundred five thousand, five hundred thirteen".