51205135 has 4 divisors (see below), whose sum is σ = 61446168. Its totient is φ = 40964104.

The previous prime is 51205127. The next prime is 51205163. The reversal of 51205135 is 53150215.

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 51205135 - 2³ = 51205127 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, 5120509 + ... + 5120518.

It is an arithmetic number, because the mean of its divisors is an integer number (15361542).

Almost surely, 2^51205135 is an apocalyptic number.

51205135 is a deficient number, since it is larger than the sum of its proper divisors (10241033).

51205135 is a wasteful number, since it uses less digits than its factorization.

51205135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10241032.

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

The square root of 51205135 is about 7155.7763380363. The cubic root of 51205135 is about 371.3395201067.

The spelling of 51205135 in words is "fifty-one million, two hundred five thousand, one hundred thirty-five".