145591 has 8 divisors (see below), whose sum is σ = 154224. Its totient is φ = 137280.

The previous prime is 145589. The next prime is 145601. The reversal of 145591 is 195541.

145591 is nontrivially palindromic in base 12.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145591 - 2¹ = 145589 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 (145501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2140 + ... + 2206.

It is an arithmetic number, because the mean of its divisors is an integer number (19278).

2¹⁴⁵⁵⁹¹ is an apocalyptic number.

145591 is a deficient number, since it is larger than the sum of its proper divisors (8633).

145591 is an equidigital number, since it uses as much as digits as its factorization.

145591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161.

The product of its digits is 900, while the sum is 25.

The square root of 145591 is about 381.5638871801. The cubic root of 145591 is about 52.6071583023.

The spelling of 145591 in words is "one hundred forty-five thousand, five hundred ninety-one".