51261851 has 4 divisors (see below), whose sum is σ = 54277272. Its totient is φ = 48246432.

The previous prime is 51261839. The next prime is 51261857. The reversal of 51261851 is 15816215.

51261851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15816215 = 5 ⋅3163243.

It is a cyclic number.

It is not a de Polignac number, because 51261851 - 2²² = 47067547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51261857) 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 3 ways as a sum of consecutive naturals, for example, 1507685 + ... + 1507718.

It is an arithmetic number, because the mean of its divisors is an integer number (13569318).

Almost surely, 2^51261851 is an apocalyptic number.

51261851 is a deficient number, since it is larger than the sum of its proper divisors (3015421).

51261851 is a wasteful number, since it uses less digits than its factorization.

51261851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015420.

The product of its digits is 2400, while the sum is 29.

The square root of 51261851 is about 7159.7381935375. The cubic root of 51261851 is about 371.4765709523.

The spelling of 51261851 in words is "fifty-one million, two hundred sixty-one thousand, eight hundred fifty-one".