145617985 has 16 divisors (see below), whose sum is σ = 179801856. Its totient is φ = 113158528.

The previous prime is 145617949. The next prime is 145618009. The reversal of 145617985 is 589716541.

It is a cyclic number.

It is not a de Polignac number, because 145617985 - 2²³ = 137229377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29934 + ... + 34456.

It is an arithmetic number, because the mean of its divisors is an integer number (11237616).

Almost surely, 2^145617985 is an apocalyptic number.

It is an amenable number.

145617985 is a deficient number, since it is larger than the sum of its proper divisors (34183871).

145617985 is a wasteful number, since it uses less digits than its factorization.

145617985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712.

The product of its digits is 302400, while the sum is 46.

The square root of 145617985 is about 12067.2277263670. The cubic root of 145617985 is about 526.1040831200.

The spelling of 145617985 in words is "one hundred forty-five million, six hundred seventeen thousand, nine hundred eighty-five".