51997871 has 8 divisors (see below), whose sum is σ = 54626400. Its totient is φ = 49400032.

The previous prime is 51997853. The next prime is 51997873. The reversal of 51997871 is 17879915.

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

It is a cyclic number.

It is not a de Polignac number, because 51997871 - 2⁶ = 51997807 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 (51997873) 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, 4160 + ... + 11013.

It is an arithmetic number, because the mean of its divisors is an integer number (6828300).

Almost surely, 2^51997871 is an apocalyptic number.

51997871 is a deficient number, since it is larger than the sum of its proper divisors (2628529).

51997871 is a wasteful number, since it uses less digits than its factorization.

51997871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15345.

The product of its digits is 158760, while the sum is 47.

The square root of 51997871 is about 7210.9549298273. The cubic root of 51997871 is about 373.2460216915.

The spelling of 51997871 in words is "fifty-one million, nine hundred ninety-seven thousand, eight hundred seventy-one".