145859999 has 4 divisors (see below), whose sum is σ = 149252136. Its totient is φ = 142467864.

The previous prime is 145859981. The next prime is 145860007. The reversal of 145859999 is 999958541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999958541 = 29 ⋅34481329.

It is a cyclic number.

It is not a de Polignac number, because 145859999 - 2²⁴ = 129082783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145859969) 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, 1696004 + ... + 1696089.

It is an arithmetic number, because the mean of its divisors is an integer number (37313034).

Almost surely, 2^145859999 is an apocalyptic number.

145859999 is a deficient number, since it is larger than the sum of its proper divisors (3392137).

145859999 is an equidigital number, since it uses as much as digits as its factorization.

145859999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392136.

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

The square root of 145859999 is about 12077.2513015172. The cubic root of 145859999 is about 526.3953797428.

The spelling of 145859999 in words is "one hundred forty-five million, eight hundred fifty-nine thousand, nine hundred ninety-nine".