51144869 has 2 divisors, whose sum is σ = 51144870. Its totient is φ = 51144868.

The previous prime is 51144859. The next prime is 51144881. The reversal of 51144869 is 96844115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49420900 + 1723969 = 7030^2 + 1313^2 .

It is a cyclic number.

It is not a de Polignac number, because 51144869 - 2⁴ = 51144853 is a prime.

It is a super-2 number, since 2×51144869² = 5231595250054322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51144809) 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, 25572434 + 25572435.

It is an arithmetic number, because the mean of its divisors is an integer number (25572435).

Almost surely, 2^51144869 is an apocalyptic number.

It is an amenable number.

51144869 is a deficient number, since it is larger than the sum of its proper divisors (1).

51144869 is an equidigital number, since it uses as much as digits as its factorization.

51144869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 51144869 is about 7151.5640946579. The cubic root of 51144869 is about 371.1937799513.

The spelling of 51144869 in words is "fifty-one million, one hundred forty-four thousand, eight hundred sixty-nine".