51748891 has 2 divisors, whose sum is σ = 51748892. Its totient is φ = 51748890.

The previous prime is 51748883. The next prime is 51748937. The reversal of 51748891 is 19884715.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51748891 - 2³ = 51748883 is a prime.

It is not a weakly prime, because it can be changed into another prime (51748811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25874445 + 25874446.

It is an arithmetic number, because the mean of its divisors is an integer number (25874446).

Almost surely, 2^51748891 is an apocalyptic number.

51748891 is a deficient number, since it is larger than the sum of its proper divisors (1).

51748891 is an equidigital number, since it uses as much as digits as its factorization.

51748891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 51748891 is about 7193.6702037277. The cubic root of 51748891 is about 372.6493336956.

The spelling of 51748891 in words is "fifty-one million, seven hundred forty-eight thousand, eight hundred ninety-one".