51507861 has 8 divisors (see below), whose sum is σ = 68721984. Its totient is φ = 34316160.

The previous prime is 51507853. The next prime is 51507877. The reversal of 51507861 is 16870515.

51507861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51507861 - 2³ = 51507853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51507821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805 + ... + 10181.

It is an arithmetic number, because the mean of its divisors is an integer number (8590248).

Almost surely, 2^51507861 is an apocalyptic number.

It is an amenable number.

51507861 is a deficient number, since it is larger than the sum of its proper divisors (17214123).

51507861 is a wasteful number, since it uses less digits than its factorization.

51507861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11211.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 51507861 is about 7176.8977281274. The cubic root of 51507861 is about 372.0698721221.

The spelling of 51507861 in words is "fifty-one million, five hundred seven thousand, eight hundred sixty-one".