51200165 has 4 divisors (see below), whose sum is σ = 61440204. Its totient is φ = 40960128.

The previous prime is 51200153. The next prime is 51200183. The reversal of 51200165 is 56100215.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17455684 + 33744481 = 4178^2 + 5809^2 .

It is a cyclic number.

It is not a de Polignac number, because 51200165 - 2⁶ = 51200101 is a prime.

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, 5120012 + ... + 5120021.

It is an arithmetic number, because the mean of its divisors is an integer number (15360051).

Almost surely, 2^51200165 is an apocalyptic number.

It is an amenable number.

51200165 is a deficient number, since it is larger than the sum of its proper divisors (10240039).

51200165 is a wasteful number, since it uses less digits than its factorization.

51200165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10240038.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 51200165 is about 7155.4290577155. The cubic root of 51200165 is about 371.3275055751.

The spelling of 51200165 in words is "fifty-one million, two hundred thousand, one hundred sixty-five".