51018559 has 2 divisors, whose sum is σ = 51018560. Its totient is φ = 51018558.

The previous prime is 51018551. The next prime is 51018571. The reversal of 51018559 is 95581015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51018559 - 2³ = 51018551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51018551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25509279 + 25509280.

It is an arithmetic number, because the mean of its divisors is an integer number (25509280).

Almost surely, 2^51018559 is an apocalyptic number.

51018559 is a deficient number, since it is larger than the sum of its proper divisors (1).

51018559 is an equidigital number, since it uses as much as digits as its factorization.

51018559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 34.

The square root of 51018559 is about 7142.7277002557. The cubic root of 51018559 is about 370.8879549667.

The spelling of 51018559 in words is "fifty-one million, eighteen thousand, five hundred fifty-nine".