51661171 has 4 divisors (see below), whose sum is σ = 54380200. Its totient is φ = 48942144.

The previous prime is 51661153. The next prime is 51661219. The reversal of 51661171 is 17116615.

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 51661171 - 2²¹ = 49564019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51661471) 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, 1359486 + ... + 1359523.

It is an arithmetic number, because the mean of its divisors is an integer number (13595050).

Almost surely, 2^51661171 is an apocalyptic number.

51661171 is a deficient number, since it is larger than the sum of its proper divisors (2719029).

51661171 is a wasteful number, since it uses less digits than its factorization.

51661171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719028.

The product of its digits is 1260, while the sum is 28.

The square root of 51661171 is about 7187.5705909577. The cubic root of 51661171 is about 372.4386542222.

Adding to 51661171 its reverse (17116615), we get a palindrome (68777786).

The spelling of 51661171 in words is "fifty-one million, six hundred sixty-one thousand, one hundred seventy-one".