51851873 has 4 divisors (see below), whose sum is σ = 52067268. Its totient is φ = 51636480.

The previous prime is 51851869. The next prime is 51851927. The reversal of 51851873 is 37815815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46689889 + 5161984 = 6833^2 + 2272^2 .

It is a cyclic number.

It is not a de Polignac number, because 51851873 - 2² = 51851869 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51851803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107336 + ... + 107817.

It is an arithmetic number, because the mean of its divisors is an integer number (13016817).

Almost surely, 2^51851873 is an apocalyptic number.

It is an amenable number.

51851873 is a deficient number, since it is larger than the sum of its proper divisors (215395).

51851873 is a wasteful number, since it uses less digits than its factorization.

51851873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215394.

The product of its digits is 33600, while the sum is 38.

The square root of 51851873 is about 7200.8244666844. The cubic root of 51851873 is about 372.8963647233.

The spelling of 51851873 in words is "fifty-one million, eight hundred fifty-one thousand, eight hundred seventy-three".