51871812 has 12 divisors (see below), whose sum is σ = 121034256. Its totient is φ = 17290600.

The previous prime is 51871769. The next prime is 51871823. The reversal of 51871812 is 21817815.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2161314 + ... + 2161337.

It is an arithmetic number, because the mean of its divisors is an integer number (10086188).

Almost surely, 2^51871812 is an apocalyptic number.

It is an amenable number.

51871812 is an abundant number, since it is smaller than the sum of its proper divisors (69162444).

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

51871812 is a wasteful number, since it uses less digits than its factorization.

51871812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322658 (or 4322656 counting only the distinct ones).

The product of its digits is 4480, while the sum is 33.

The square root of 51871812 is about 7202.2088278527. The cubic root of 51871812 is about 372.9441561681.

The spelling of 51871812 in words is "fifty-one million, eight hundred seventy-one thousand, eight hundred twelve".