51065559 has 20 divisors (see below), whose sum is σ = 80300440. Its totient is φ = 32250960.

The previous prime is 51065533. The next prime is 51065579. The reversal of 51065559 is 95556015.

It is not a de Polignac number, because 51065559 - 2⁵ = 51065527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51065579) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15052 + ... + 18129.

It is an arithmetic number, because the mean of its divisors is an integer number (4015022).

Almost surely, 2^51065559 is an apocalyptic number.

51065559 is a deficient number, since it is larger than the sum of its proper divisors (29234881).

51065559 is a wasteful number, since it uses less digits than its factorization.

51065559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33212 (or 33203 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

The square root of 51065559 is about 7146.0170024987. The cubic root of 51065559 is about 371.0018114669.

The spelling of 51065559 in words is "fifty-one million, sixty-five thousand, five hundred fifty-nine".