51445009 has 16 divisors (see below), whose sum is σ = 67913856. Its totient is φ = 37728000.

The previous prime is 51444973. The next prime is 51445019. The reversal of 51445009 is 90054415.

It is a cyclic number.

It is not a de Polignac number, because 51445009 - 2⁷ = 51444881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51445019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18342 + ... + 20959.

It is an arithmetic number, because the mean of its divisors is an integer number (4244616).

Almost surely, 2^51445009 is an apocalyptic number.

It is an amenable number.

51445009 is a deficient number, since it is larger than the sum of its proper divisors (16468847).

51445009 is a wasteful number, since it uses less digits than its factorization.

51445009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39336.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51445009 is about 7172.5176193579. The cubic root of 51445009 is about 371.9184722288.

It can be divided in two parts, 5144 and 5009, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 51445009 in words is "fifty-one million, four hundred forty-five thousand, nine".