145491 has 4 divisors (see below), whose sum is σ = 193992. Its totient is φ = 96992.

The previous prime is 145487. The next prime is 145501. The reversal of 145491 is 194541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145491 - 2² = 145487 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (145441) 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, 24246 + ... + 24251.

It is an arithmetic number, because the mean of its divisors is an integer number (48498).

2¹⁴⁵⁴⁹¹ is an apocalyptic number.

145491 is a deficient number, since it is larger than the sum of its proper divisors (48501).

145491 is an equidigital number, since it uses as much as digits as its factorization.

145491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48500.

The product of its digits is 720, while the sum is 24.

The square root of 145491 is about 381.4328250164. The cubic root of 145491 is about 52.5951110358.

It can be divided in two parts, 145 and 491, that added together give a palindrome (636).

The spelling of 145491 in words is "one hundred forty-five thousand, four hundred ninety-one".