51317861 has 8 divisors (see below), whose sum is σ = 58787904. Its totient is φ = 43882560.

The previous prime is 51317839. The next prime is 51317867. The reversal of 51317861 is 16871315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51317861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51317867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5435 + ... + 11496.

It is an arithmetic number, because the mean of its divisors is an integer number (7348488).

Almost surely, 2^51317861 is an apocalyptic number.

It is an amenable number.

51317861 is a deficient number, since it is larger than the sum of its proper divisors (7470043).

51317861 is a wasteful number, since it uses less digits than its factorization.

51317861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17371.

The product of its digits is 5040, while the sum is 32.

The square root of 51317861 is about 7163.6485815540. The cubic root of 51317861 is about 371.6118166179.

The spelling of 51317861 in words is "fifty-one million, three hundred seventeen thousand, eight hundred sixty-one".