145738181 has 4 divisors (see below), whose sum is σ = 148488012. Its totient is φ = 142988352.

The previous prime is 145738171. The next prime is 145738193. The reversal of 145738181 is 181837541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181837541 = 53 ⋅3430897.

It can be written as a sum of positive squares in 2 ways, for example, as 35593156 + 110145025 = 5966^2 + 10495^2 .

It is a cyclic number.

It is not a de Polignac number, because 145738181 - 2²² = 141543877 is a prime.

It is a super-2 number, since 2×145738181² = 42479234802377522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145738111) 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, 1374836 + ... + 1374941.

It is an arithmetic number, because the mean of its divisors is an integer number (37122003).

Almost surely, 2^145738181 is an apocalyptic number.

It is an amenable number.

145738181 is a deficient number, since it is larger than the sum of its proper divisors (2749831).

145738181 is an equidigital number, since it uses as much as digits as its factorization.

145738181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749830.

The product of its digits is 26880, while the sum is 38.

The square root of 145738181 is about 12072.2069647600. The cubic root of 145738181 is about 526.2487955919.

The spelling of 145738181 in words is "one hundred forty-five million, seven hundred thirty-eight thousand, one hundred eighty-one".