51821912 has 8 divisors (see below), whose sum is σ = 97166100. Its totient is φ = 25910952.

The previous prime is 51821893. The next prime is 51821951. The reversal of 51821912 is 21912815.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3238862 + ... + 3238877.

Almost surely, 2^51821912 is an apocalyptic number.

It is an amenable number.

51821912 is a deficient number, since it is larger than the sum of its proper divisors (45344188).

51821912 is a wasteful number, since it uses less digits than its factorization.

51821912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6477745 (or 6477741 counting only the distinct ones).

The product of its digits is 1440, while the sum is 29.

The square root of 51821912 is about 7198.7437792993. The cubic root of 51821912 is about 372.8245286777.

The spelling of 51821912 in words is "fifty-one million, eight hundred twenty-one thousand, nine hundred twelve".