180999899 has 2 divisors, whose sum is σ = 180999900. Its totient is φ = 180999898.

The previous prime is 180999883. The next prime is 180999911. The reversal of 180999899 is 998999081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 180999899 - 2⁴ = 180999883 is a prime.

It is not a weakly prime, because it can be changed into another prime (180999829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90499949 + 90499950.

It is an arithmetic number, because the mean of its divisors is an integer number (90499950).

Almost surely, 2^180999899 is an apocalyptic number.

180999899 is a deficient number, since it is larger than the sum of its proper divisors (1).

180999899 is an equidigital number, since it uses as much as digits as its factorization.

180999899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3779136, while the sum is 62.

The square root of 180999899 is about 13453.6202934377. The cubic root of 180999899 is about 565.6651773664.

The spelling of 180999899 in words is "one hundred eighty million, nine hundred ninety-nine thousand, eight hundred ninety-nine".