145818281 has 4 divisors (see below), whose sum is σ = 166649472. Its totient is φ = 124987092.

The previous prime is 145818247. The next prime is 145818287. The reversal of 145818281 is 182818541.

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, and also an emirpimes, since its reverse is a distinct semiprime: 182818541 = 829 ⋅220529.

It is a cyclic number.

It is not a de Polignac number, because 145818281 - 2¹⁸ = 145556137 is a prime.

It is a super-2 number, since 2×145818281² = 42525942147589922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145818287) 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, 10415585 + ... + 10415598.

It is an arithmetic number, because the mean of its divisors is an integer number (41662368).

Almost surely, 2^145818281 is an apocalyptic number.

It is an amenable number.

145818281 is a deficient number, since it is larger than the sum of its proper divisors (20831191).

145818281 is an equidigital number, since it uses as much as digits as its factorization.

145818281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20831190.

The product of its digits is 20480, while the sum is 38.

The square root of 145818281 is about 12075.5240465994. The cubic root of 145818281 is about 526.3451894768.

The spelling of 145818281 in words is "one hundred forty-five million, eight hundred eighteen thousand, two hundred eighty-one".