51665151 has 4 divisors (see below), whose sum is σ = 68886872. Its totient is φ = 34443432.

The previous prime is 51665149. The next prime is 51665191. The reversal of 51665151 is 15156615.

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

It is not a de Polignac number, because 51665151 - 2¹ = 51665149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8610856 + ... + 8610861.

It is an arithmetic number, because the mean of its divisors is an integer number (17221718).

Almost surely, 2^51665151 is an apocalyptic number.

51665151 is a deficient number, since it is larger than the sum of its proper divisors (17221721).

51665151 is a wasteful number, since it uses less digits than its factorization.

51665151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17221720.

The product of its digits is 4500, while the sum is 30.

The square root of 51665151 is about 7187.8474524714. The cubic root of 51665151 is about 372.4482182574.

The spelling of 51665151 in words is "fifty-one million, six hundred sixty-five thousand, one hundred fifty-one".