145299181 has 4 divisors (see below), whose sum is σ = 145535292. Its totient is φ = 145063072.

The previous prime is 145299179. The next prime is 145299197. The reversal of 145299181 is 181992541.

145299181 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 an emirpimes, since its reverse is a distinct semiprime: 181992541 = 1013 ⋅179657.

It can be written as a sum of positive squares in 2 ways, for example, as 6295081 + 139004100 = 2509^2 + 11790^2 .

It is a cyclic number.

It is not a de Polignac number, because 145299181 - 2¹ = 145299179 is a prime.

It is a super-2 number, since 2×145299181² = 42223703998541522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145299281) 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, 117130 + ... + 118363.

It is an arithmetic number, because the mean of its divisors is an integer number (36383823).

Almost surely, 2^145299181 is an apocalyptic number.

It is an amenable number.

145299181 is a deficient number, since it is larger than the sum of its proper divisors (236111).

145299181 is an equidigital number, since it uses as much as digits as its factorization.

145299181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236110.

The product of its digits is 25920, while the sum is 40.

The square root of 145299181 is about 12054.0109921967. The cubic root of 145299181 is about 525.7198663040.

The spelling of 145299181 in words is "one hundred forty-five million, two hundred ninety-nine thousand, one hundred eighty-one".