145567281 has 4 divisors (see below), whose sum is σ = 194089712. Its totient is φ = 97044852.

The previous prime is 145567267. The next prime is 145567297. The reversal of 145567281 is 182765541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 145567281 - 2⁵ = 145567249 is a prime.

It is a super-2 number, since 2×145567281² = 42379666595465922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145567241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24261211 + ... + 24261216.

It is an arithmetic number, because the mean of its divisors is an integer number (48522428).

Almost surely, 2^145567281 is an apocalyptic number.

It is an amenable number.

145567281 is a deficient number, since it is larger than the sum of its proper divisors (48522431).

145567281 is an equidigital number, since it uses as much as digits as its factorization.

145567281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48522430.

The product of its digits is 67200, while the sum is 39.

The square root of 145567281 is about 12065.1266466623. The cubic root of 145567281 is about 526.0430131037.

The spelling of 145567281 in words is "one hundred forty-five million, five hundred sixty-seven thousand, two hundred eighty-one".