51165571 has 4 divisors (see below), whose sum is σ = 52355512. Its totient is φ = 49975632.

The previous prime is 51165509. The next prime is 51165577. The reversal of 51165571 is 17556115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17556115 = 5 ⋅3511223.

It is not a de Polignac number, because 51165571 - 2¹⁷ = 51034499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51165577) 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, 594906 + ... + 594991.

It is an arithmetic number, because the mean of its divisors is an integer number (13088878).

Almost surely, 2^51165571 is an apocalyptic number.

51165571 is a deficient number, since it is larger than the sum of its proper divisors (1189941).

51165571 is a wasteful number, since it uses less digits than its factorization.

51165571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189940.

The product of its digits is 5250, while the sum is 31.

The square root of 51165571 is about 7153.0113239111. The cubic root of 51165571 is about 371.2438561186.

The spelling of 51165571 in words is "fifty-one million, one hundred sixty-five thousand, five hundred seventy-one".