51144991 has 2 divisors, whose sum is σ = 51144992. Its totient is φ = 51144990.

The previous prime is 51144983. The next prime is 51145001. The reversal of 51144991 is 19944115.

51144991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51144991 - 2³ = 51144983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51144391) 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 as a sum of consecutive naturals, namely, 25572495 + 25572496.

It is an arithmetic number, because the mean of its divisors is an integer number (25572496).

Almost surely, 2^51144991 is an apocalyptic number.

51144991 is a deficient number, since it is larger than the sum of its proper divisors (1).

51144991 is an equidigital number, since it uses as much as digits as its factorization.

51144991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 51144991 is about 7151.5726242555. The cubic root of 51144991 is about 371.1940750973.

The spelling of 51144991 in words is "fifty-one million, one hundred forty-four thousand, nine hundred ninety-one".