51072861 has 8 divisors (see below), whose sum is σ = 77825344. Its totient is φ = 29184480.

The previous prime is 51072851. The next prime is 51072869. The reversal of 51072861 is 16827015.

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

It is not a de Polignac number, because 51072861 - 2⁵ = 51072829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51072869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1216000 + ... + 1216041.

It is an arithmetic number, because the mean of its divisors is an integer number (9728168).

Almost surely, 2^51072861 is an apocalyptic number.

It is an amenable number.

51072861 is a deficient number, since it is larger than the sum of its proper divisors (26752483).

51072861 is a wasteful number, since it uses less digits than its factorization.

51072861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432051.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 51072861 is about 7146.5278982174. The cubic root of 51072861 is about 371.0194941358.

Adding to 51072861 its reverse (16827015), we get a palindrome (67899876).

The spelling of 51072861 in words is "fifty-one million, seventy-two thousand, eight hundred sixty-one".