51871995 has 112 divisors (see below), whose sum is σ = 113322240. Its totient is φ = 22254912.

The previous prime is 51871993. The next prime is 51871999. The reversal of 51871995 is 59917815.

It is not a de Polignac number, because 51871995 - 2¹ = 51871993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51871995.

It is not an unprimeable number, because it can be changed into a prime (51871993) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 484732 + ... + 484838.

Almost surely, 2^51871995 is an apocalyptic number.

51871995 is an abundant number, since it is smaller than the sum of its proper divisors (61450245).

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

51871995 is a wasteful number, since it uses less digits than its factorization.

51871995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 141 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 51871995 is about 7202.2215322774. The cubic root of 51871995 is about 372.9445947409.

The spelling of 51871995 in words is "fifty-one million, eight hundred seventy-one thousand, nine hundred ninety-five".