51971842 has 8 divisors (see below), whose sum is σ = 83954556. Its totient is φ = 23986992.

The previous prime is 51971831. The next prime is 51971851. The reversal of 51971842 is 24817915.

It can be written as a sum of positive squares in 2 ways, for example, as 45576001 + 6395841 = 6751^2 + 2529^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 999433 + ... + 999484.

Almost surely, 2^51971842 is an apocalyptic number.

51971842 is a deficient number, since it is larger than the sum of its proper divisors (31982714).

51971842 is a wasteful number, since it uses less digits than its factorization.

51971842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998932.

The product of its digits is 20160, while the sum is 37.

The square root of 51971842 is about 7209.1498805338. The cubic root of 51971842 is about 373.1837316911.

It can be divided in two parts, 519 and 71842, that added together give a square (72361 = 269²).

The spelling of 51971842 in words is "fifty-one million, nine hundred seventy-one thousand, eight hundred forty-two".