51289886 has 4 divisors (see below), whose sum is σ = 76934832. Its totient is φ = 25644942.

The previous prime is 51289879. The next prime is 51289891. The reversal of 51289886 is 68898215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68898215 = 5 ⋅13779643.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51289886.

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, 12822470 + ... + 12822473.

It is an arithmetic number, because the mean of its divisors is an integer number (19233708).

Almost surely, 2^51289886 is an apocalyptic number.

51289886 is a deficient number, since it is larger than the sum of its proper divisors (25644946).

51289886 is a wasteful number, since it uses less digits than its factorization.

51289886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25644945.

The product of its digits is 276480, while the sum is 47.

The square root of 51289886 is about 7161.6957489131. The cubic root of 51289886 is about 371.5442785329.

The spelling of 51289886 in words is "fifty-one million, two hundred eighty-nine thousand, eight hundred eighty-six".