147257281 has 12 divisors (see below), whose sum is σ = 159846156. Its totient is φ = 135188480.

The previous prime is 147257269. The next prime is 147257287. The reversal of 147257281 is 182752741.

It can be written as a sum of positive squares in 6 ways, for example, as 17297281 + 129960000 = 4159^2 + 11400^2 .

It is not a de Polignac number, because 147257281 - 2⁷ = 147257153 is a prime.

It is a super-2 number, since 2×147257281² = 43369413615025922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 147257281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147257287) 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, 26001 + ... + 31153.

It is an arithmetic number, because the mean of its divisors is an integer number (13320513).

Almost surely, 2^147257281 is an apocalyptic number.

It is an amenable number.

147257281 is a deficient number, since it is larger than the sum of its proper divisors (12588875).

147257281 is an equidigital number, since it uses as much as digits as its factorization.

147257281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252 (or 5211 counting only the distinct ones).

The product of its digits is 31360, while the sum is 37.

The square root of 147257281 is about 12134.9611041816. The cubic root of 147257281 is about 528.0709283063.

The spelling of 147257281 in words is "one hundred forty-seven million, two hundred fifty-seven thousand, two hundred eighty-one".