51520015 has 4 divisors (see below), whose sum is σ = 61824024. Its totient is φ = 41216008.

The previous prime is 51520003. The next prime is 51520033. The reversal of 51520015 is 51002515.

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

It is a cyclic number.

It is not a de Polignac number, because 51520015 - 2⁵ = 51519983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51519974 and 51520001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5151997 + ... + 5152006.

It is an arithmetic number, because the mean of its divisors is an integer number (15456006).

Almost surely, 2^51520015 is an apocalyptic number.

51520015 is a deficient number, since it is larger than the sum of its proper divisors (10304009).

51520015 is a wasteful number, since it uses less digits than its factorization.

51520015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304008.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 51520015 is about 7177.7444228671. The cubic root of 51520015 is about 372.0991348501.

The spelling of 51520015 in words is "fifty-one million, five hundred twenty thousand, fifteen".