51520135 has 4 divisors (see below), whose sum is σ = 61824168. Its totient is φ = 41216104.

The previous prime is 51520129. The next prime is 51520151. The reversal of 51520135 is 53102515.

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 51520135 - 2⁵ = 51520103 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 5152009 + ... + 5152018.

It is an arithmetic number, because the mean of its divisors is an integer number (15456042).

Almost surely, 2^51520135 is an apocalyptic number.

51520135 is a deficient number, since it is larger than the sum of its proper divisors (10304033).

51520135 is a wasteful number, since it uses less digits than its factorization.

51520135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304032.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51520135 is about 7177.7527820342. The cubic root of 51520135 is about 372.0994237466.

The spelling of 51520135 in words is "fifty-one million, five hundred twenty thousand, one hundred thirty-five".