51871986 has 24 divisors (see below), whose sum is σ = 112592064. Its totient is φ = 17259480.

The previous prime is 51871943. The next prime is 51871987. The reversal of 51871986 is 68917815.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51871987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9075 + ... + 13641.

It is an arithmetic number, because the mean of its divisors is an integer number (4691336).

Almost surely, 2^51871986 is an apocalyptic number.

51871986 is an abundant number, since it is smaller than the sum of its proper divisors (60720078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51871986 is a wasteful number, since it uses less digits than its factorization.

51871986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5206 (or 5203 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 51871986 is about 7202.2209074701. The cubic root of 51871986 is about 372.9445731718.

The spelling of 51871986 in words is "fifty-one million, eight hundred seventy-one thousand, nine hundred eighty-six".