51042165 has 16 divisors (see below), whose sum is σ = 82462848. Its totient is φ = 26957376.

The previous prime is 51042149. The next prime is 51042169. The reversal of 51042165 is 56124015.

It is not a de Polignac number, because 51042165 - 2⁴ = 51042149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51042169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14974 + ... + 18063.

It is an arithmetic number, because the mean of its divisors is an integer number (5153928).

Almost surely, 2^51042165 is an apocalyptic number.

It is an amenable number.

51042165 is a deficient number, since it is larger than the sum of its proper divisors (31420683).

51042165 is a wasteful number, since it uses less digits than its factorization.

51042165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33148.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 51042165 is about 7144.3799591007. The cubic root of 51042165 is about 370.9451487360.

The spelling of 51042165 in words is "fifty-one million, forty-two thousand, one hundred sixty-five".