51353891 has 4 divisors (see below), whose sum is σ = 52741872. Its totient is φ = 49965912.

The previous prime is 51353881. The next prime is 51353921. The reversal of 51353891 is 19835315.

51353891 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51353891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51353831) 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, 693935 + ... + 694008.

It is an arithmetic number, because the mean of its divisors is an integer number (13185468).

Almost surely, 2^51353891 is an apocalyptic number.

51353891 is a deficient number, since it is larger than the sum of its proper divisors (1387981).

51353891 is a wasteful number, since it uses less digits than its factorization.

51353891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387980.

The product of its digits is 16200, while the sum is 35.

The square root of 51353891 is about 7166.1629202803. The cubic root of 51353891 is about 371.6987651723.

The spelling of 51353891 in words is "fifty-one million, three hundred fifty-three thousand, eight hundred ninety-one".