51891745 has 8 divisors (see below), whose sum is σ = 62326080. Its totient is φ = 41476080.

The previous prime is 51891659. The next prime is 51891751. The reversal of 51891745 is 54719815.

It is a happy number.

51891745 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 51891745 - 2⁷ = 51891617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51891698 and 51891707.

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 7 ways as a sum of consecutive naturals, for example, 2436 + ... + 10474.

It is an arithmetic number, because the mean of its divisors is an integer number (7790760).

Almost surely, 2^51891745 is an apocalyptic number.

It is an amenable number.

51891745 is a deficient number, since it is larger than the sum of its proper divisors (10434335).

51891745 is a wasteful number, since it uses less digits than its factorization.

51891745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9335.

The product of its digits is 50400, while the sum is 40.

The square root of 51891745 is about 7203.5925065206. The cubic root of 51891745 is about 372.9919209917.

The spelling of 51891745 in words is "fifty-one million, eight hundred ninety-one thousand, seven hundred forty-five".