154985899 has 2 divisors, whose sum is σ = 154985900. Its totient is φ = 154985898.

The previous prime is 154985881. The next prime is 154985903. The reversal of 154985899 is 998589451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 154985899 - 2⁹ = 154985387 is a prime.

It is not a weakly prime, because it can be changed into another prime (154985849) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77492949 + 77492950.

It is an arithmetic number, because the mean of its divisors is an integer number (77492950).

Almost surely, 2^154985899 is an apocalyptic number.

154985899 is a deficient number, since it is larger than the sum of its proper divisors (1).

154985899 is an equidigital number, since it uses as much as digits as its factorization.

154985899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 58.

The square root of 154985899 is about 12449.3332753204. Note that the first 3 decimals coincide. The cubic root of 154985899 is about 537.1522455090.

The spelling of 154985899 in words is "one hundred fifty-four million, nine hundred eighty-five thousand, eight hundred ninety-nine".