145720241 has 4 divisors (see below), whose sum is σ = 145744500. Its totient is φ = 145695984.

The previous prime is 145720231. The next prime is 145720261. The reversal of 145720241 is 142027541.

145720241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 142027541 = 11503 ⋅12347.

It can be written as a sum of positive squares in 2 ways, for example, as 3610000 + 142110241 = 1900^2 + 11921^2 .

It is a cyclic number.

It is not a de Polignac number, because 145720241 - 2¹⁸ = 145458097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 145720241.

It is not an unprimeable number, because it can be changed into a prime (145720231) 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, 4295 + ... + 17603.

It is an arithmetic number, because the mean of its divisors is an integer number (36436125).

Almost surely, 2^145720241 is an apocalyptic number.

It is an amenable number.

145720241 is a deficient number, since it is larger than the sum of its proper divisors (24259).

145720241 is a wasteful number, since it uses less digits than its factorization.

145720241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24258.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 145720241 is about 12071.4639128815. The cubic root of 145720241 is about 526.2272014091.

Adding to 145720241 its reverse (142027541), we get a palindrome (287747782).

The spelling of 145720241 in words is "one hundred forty-five million, seven hundred twenty thousand, two hundred forty-one".