51171997 has 4 divisors (see below), whose sum is σ = 53865280. Its totient is φ = 48478716.

The previous prime is 51171947. The next prime is 51172003. The reversal of 51171997 is 79917115.

51171997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51171997 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 (51171947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1346613 + ... + 1346650.

It is an arithmetic number, because the mean of its divisors is an integer number (13466320).

Almost surely, 2^51171997 is an apocalyptic number.

It is an amenable number.

51171997 is a deficient number, since it is larger than the sum of its proper divisors (2693283).

51171997 is a wasteful number, since it uses less digits than its factorization.

51171997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693282.

The product of its digits is 19845, while the sum is 40.

The square root of 51171997 is about 7153.4604912588. The cubic root of 51171997 is about 371.2593972537.

The spelling of 51171997 in words is "fifty-one million, one hundred seventy-one thousand, nine hundred ninety-seven".