51351891 has 8 divisors (see below), whose sum is σ = 68524944. Its totient is φ = 34206720.

The previous prime is 51351857. The next prime is 51351899. The reversal of 51351891 is 19815315.

51351891 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 51351891 - 2⁶ = 51351827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51351899) 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, 2206 + ... + 10371.

It is an arithmetic number, because the mean of its divisors is an integer number (8565618).

Almost surely, 2^51351891 is an apocalyptic number.

51351891 is a deficient number, since it is larger than the sum of its proper divisors (17173053).

51351891 is a wasteful number, since it uses less digits than its factorization.

51351891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13941.

The product of its digits is 5400, while the sum is 33.

The square root of 51351891 is about 7166.0233742293. The cubic root of 51351891 is about 371.6939397853.

The spelling of 51351891 in words is "fifty-one million, three hundred fifty-one thousand, eight hundred ninety-one".