51513505 has 8 divisors (see below), whose sum is σ = 62158824. Its totient is φ = 40982400.

The previous prime is 51513433. The next prime is 51513533. The reversal of 51513505 is 50531515.

It can be written as a sum of positive squares in 4 ways, for example, as 2611456 + 48902049 = 1616^2 + 6993^2 .

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

It is not a de Polignac number, because 51513505 - 2⁷ = 51513377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51513505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27556 + ... + 29365.

It is an arithmetic number, because the mean of its divisors is an integer number (7769853).

Almost surely, 2^51513505 is an apocalyptic number.

It is an amenable number.

51513505 is a deficient number, since it is larger than the sum of its proper divisors (10645319).

51513505 is a wasteful number, since it uses less digits than its factorization.

51513505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57107.

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

The square root of 51513505 is about 7177.2909234613. The cubic root of 51513505 is about 372.0834615407.

The spelling of 51513505 in words is "fifty-one million, five hundred thirteen thousand, five hundred five".