51575513 has 4 divisors (see below), whose sum is σ = 56264208. Its totient is φ = 46886820.

The previous prime is 51575509. The next prime is 51575551. The reversal of 51575513 is 31557515.

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 51575513 - 2² = 51575509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51575513.

It is not an unprimeable number, because it can be changed into a prime (51575113) 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, 2344331 + ... + 2344352.

It is an arithmetic number, because the mean of its divisors is an integer number (14066052).

Almost surely, 2^51575513 is an apocalyptic number.

It is an amenable number.

51575513 is a deficient number, since it is larger than the sum of its proper divisors (4688695).

51575513 is a wasteful number, since it uses less digits than its factorization.

51575513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4688694.

The product of its digits is 13125, while the sum is 32.

The square root of 51575513 is about 7181.6093600251. The cubic root of 51575513 is about 372.2326968398.

The spelling of 51575513 in words is "fifty-one million, five hundred seventy-five thousand, five hundred thirteen".