51445729 has 2 divisors, whose sum is σ = 51445730. Its totient is φ = 51445728.

The previous prime is 51445727. The next prime is 51445747. The reversal of 51445729 is 92754415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50339025 + 1106704 = 7095^2 + 1052^2 .

It is a cyclic number.

It is not a de Polignac number, because 51445729 - 2¹ = 51445727 is a prime.

Together with 51445727, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51445727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25722864 + 25722865.

It is an arithmetic number, because the mean of its divisors is an integer number (25722865).

Almost surely, 2^51445729 is an apocalyptic number.

It is an amenable number.

51445729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51445729 is an equidigital number, since it uses as much as digits as its factorization.

51445729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 51445729 is about 7172.5678107635. The cubic root of 51445729 is about 371.9202072857.

The spelling of 51445729 in words is "fifty-one million, four hundred forty-five thousand, seven hundred twenty-nine".