18059551 has 2 divisors, whose sum is σ = 18059552. Its totient is φ = 18059550.

The previous prime is 18059539. The next prime is 18059579. The reversal of 18059551 is 15595081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18059551 - 2⁹ = 18059039 is a prime.

It is a super-2 number, since 2×18059551² = 652294764643202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18059501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9029775 + 9029776.

It is an arithmetic number, because the mean of its divisors is an integer number (9029776).

Almost surely, 2^18059551 is an apocalyptic number.

18059551 is a deficient number, since it is larger than the sum of its proper divisors (1).

18059551 is an equidigital number, since it uses as much as digits as its factorization.

18059551 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 18059551 is about 4249.6530446614. The cubic root of 18059551 is about 262.3628356717.

The spelling of 18059551 in words is "eighteen million, fifty-nine thousand, five hundred fifty-one".