147839281 has 4 divisors (see below), whose sum is σ = 148452964. Its totient is φ = 147225600.

The previous prime is 147839273. The next prime is 147839297. The reversal of 147839281 is 182938741.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182938741 = 1553 ⋅117797.

It can be written as a sum of positive squares in 2 ways, for example, as 130325056 + 17514225 = 11416^2 + 4185^2 .

It is a cyclic number.

It is not a de Polignac number, because 147839281 - 2³ = 147839273 is a prime.

It is a super-2 number, since 2×147839281² = 43712906013193922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147839201) 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, 306480 + ... + 306961.

It is an arithmetic number, because the mean of its divisors is an integer number (37113241).

Almost surely, 2^147839281 is an apocalyptic number.

It is an amenable number.

147839281 is a deficient number, since it is larger than the sum of its proper divisors (613683).

147839281 is an equidigital number, since it uses as much as digits as its factorization.

147839281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613682.

The product of its digits is 96768, while the sum is 43.

The square root of 147839281 is about 12158.9177561163. The cubic root of 147839281 is about 528.7657061173.

The spelling of 147839281 in words is "one hundred forty-seven million, eight hundred thirty-nine thousand, two hundred eighty-one".