51651671 has 4 divisors (see below), whose sum is σ = 54370200. Its totient is φ = 48933144.

The previous prime is 51651659. The next prime is 51651679. The reversal of 51651671 is 17615615.

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 51651671 - 2²² = 47457367 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 (51651679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1359236 + ... + 1359273.

It is an arithmetic number, because the mean of its divisors is an integer number (13592550).

Almost surely, 2^51651671 is an apocalyptic number.

51651671 is a deficient number, since it is larger than the sum of its proper divisors (2718529).

51651671 is a wasteful number, since it uses less digits than its factorization.

51651671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718528.

The product of its digits is 6300, while the sum is 32.

The square root of 51651671 is about 7186.9096974986. The cubic root of 51651671 is about 372.4158235091.

The spelling of 51651671 in words is "fifty-one million, six hundred fifty-one thousand, six hundred seventy-one".