145002281 has 16 divisors (see below), whose sum is σ = 163175040. Its totient is φ = 128177280.

The previous prime is 145002241. The next prime is 145002289. The reversal of 145002281 is 182200541.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145002281 is a prime.

It is a super-2 number, since 2×145002281² = 42051322990405922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145002289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13871 + ... + 21963.

It is an arithmetic number, because the mean of its divisors is an integer number (10198440).

Almost surely, 2^145002281 is an apocalyptic number.

It is an amenable number.

145002281 is a deficient number, since it is larger than the sum of its proper divisors (18172759).

145002281 is a wasteful number, since it uses less digits than its factorization.

145002281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8176.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 145002281 is about 12041.6892917896. The cubic root of 145002281 is about 525.3615420472.

The spelling of 145002281 in words is "one hundred forty-five million, two thousand, two hundred eighty-one".