145359985 has 4 divisors (see below), whose sum is σ = 174431988. Its totient is φ = 116287984.

The previous prime is 145359983. The next prime is 145359989. The reversal of 145359985 is 589953541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589953541 = 47 ⋅12552203.

It can be written as a sum of positive squares in 2 ways, for example, as 110691441 + 34668544 = 10521^2 + 5888^2 .

It is a cyclic number.

It is not a de Polignac number, because 145359985 - 2¹ = 145359983 is a prime.

It is a super-2 number, since 2×145359985² = 42259050478400450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145359983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14535994 + ... + 14536003.

It is an arithmetic number, because the mean of its divisors is an integer number (43607997).

Almost surely, 2^145359985 is an apocalyptic number.

It is an amenable number.

145359985 is a deficient number, since it is larger than the sum of its proper divisors (29072003).

145359985 is an equidigital number, since it uses as much as digits as its factorization.

145359985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29072002.

The product of its digits is 972000, while the sum is 49.

The square root of 145359985 is about 12056.5328764119. The cubic root of 145359985 is about 525.7931895272.

The spelling of 145359985 in words is "one hundred forty-five million, three hundred fifty-nine thousand, nine hundred eighty-five".