18955529 has 2 divisors, whose sum is σ = 18955530. Its totient is φ = 18955528.

The previous prime is 18955511. The next prime is 18955583. The reversal of 18955529 is 92555981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18939904 + 15625 = 4352^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 18955529 - 2⁸ = 18955273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18955529.

It is not a weakly prime, because it can be changed into another prime (18957529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9477764 + 9477765.

It is an arithmetic number, because the mean of its divisors is an integer number (9477765).

Almost surely, 2^18955529 is an apocalyptic number.

It is an amenable number.

18955529 is a deficient number, since it is larger than the sum of its proper divisors (1).

18955529 is an equidigital number, since it uses as much as digits as its factorization.

18955529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 44.

The square root of 18955529 is about 4353.7947815670. The cubic root of 18955529 is about 266.6318154107.

The spelling of 18955529 in words is "eighteen million, nine hundred fifty-five thousand, five hundred twenty-nine".