145618281 has 12 divisors (see below), whose sum is σ = 210673008. Its totient is φ = 96924024.

The previous prime is 145618279. The next prime is 145618303. The reversal of 145618281 is 182816541.

145618281 is a `hidden beast` number, since 14 + 5 + 618 + 28 + 1 = 666.

It is not a de Polignac number, because 145618281 - 2¹ = 145618279 is a prime.

It is a super-2 number, since 2×145618281² = 42409367522789922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145618201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6795 + ... + 18368.

It is an arithmetic number, because the mean of its divisors is an integer number (17556084).

Almost surely, 2^145618281 is an apocalyptic number.

It is an amenable number.

145618281 is a deficient number, since it is larger than the sum of its proper divisors (65054727).

145618281 is a wasteful number, since it uses less digits than its factorization.

145618281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25812 (or 25809 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 145618281 is about 12067.2399909839. The cubic root of 145618281 is about 526.1044395931.

The spelling of 145618281 in words is "one hundred forty-five million, six hundred eighteen thousand, two hundred eighty-one".