51861658 has 8 divisors (see below), whose sum is σ = 77849460. Its totient is φ = 25911840.

The previous prime is 51861643. The next prime is 51861661. The reversal of 51861658 is 85616815.

51861658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 44315649 + 7546009 = 6657^2 + 2747^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 51861658.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5793 + ... + 11716.

Almost surely, 2^51861658 is an apocalyptic number.

51861658 is a deficient number, since it is larger than the sum of its proper divisors (25987802).

51861658 is a wasteful number, since it uses less digits than its factorization.

51861658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18992.

The product of its digits is 57600, while the sum is 40.

The square root of 51861658 is about 7201.5038707203. The cubic root of 51861658 is about 372.9198197515.

The spelling of 51861658 in words is "fifty-one million, eight hundred sixty-one thousand, six hundred fifty-eight".