154999985 has 16 divisors (see below), whose sum is σ = 216912000. Its totient is φ = 106284528.

The previous prime is 154999981. The next prime is 155000023. The reversal of 154999985 is 589999451.

154999985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 154999985 - 2² = 154999981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (154999981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43475 + ... + 46904.

It is an arithmetic number, because the mean of its divisors is an integer number (13557000).

Almost surely, 2^154999985 is an apocalyptic number.

It is an amenable number.

154999985 is a deficient number, since it is larger than the sum of its proper divisors (61912015).

154999985 is an frugal number, since it uses more digits than its factorization.

154999985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90405 (or 90391 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 59.

The square root of 154999985 is about 12449.8989955742. The cubic root of 154999985 is about 537.1685181665.

The spelling of 154999985 in words is "one hundred fifty-four million, nine hundred ninety-nine thousand, nine hundred eighty-five".