145452281 has 8 divisors (see below), whose sum is σ = 158787720. Its totient is φ = 132423552.

The previous prime is 145452257. The next prime is 145452301. The reversal of 145452281 is 182254541.

It can be written as a sum of positive squares in 4 ways, for example, as 1836025 + 143616256 = 1355^2 + 11984^2 .

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 145452281 - 2¹⁸ = 145190137 is a prime.

It is a super-2 number, since 2×145452281² = 42312732096205922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145442281) 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, 75686 + ... + 77583.

It is an arithmetic number, because the mean of its divisors is an integer number (19848465).

Almost surely, 2^145452281 is an apocalyptic number.

It is an amenable number.

145452281 is a deficient number, since it is larger than the sum of its proper divisors (13335439).

145452281 is a wasteful number, since it uses less digits than its factorization.

145452281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153355.

The product of its digits is 12800, while the sum is 32.

The square root of 145452281 is about 12060.3599034191. The cubic root of 145452281 is about 525.9044497221.

It can be divided in two parts, 1454 and 52281, that added together give a palindrome (53735).

The spelling of 145452281 in words is "one hundred forty-five million, four hundred fifty-two thousand, two hundred eighty-one".