281391147 has 12 divisors (see below), whose sum is σ = 420469920. Its totient is φ = 181125168.

The previous prime is 281391139. The next prime is 281391161. The reversal of 281391147 is 741193182.

It is a happy number.

It is not a de Polignac number, because 281391147 - 2³ = 281391139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (281391167) 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, 538803 + ... + 539324.

It is an arithmetic number, because the mean of its divisors is an integer number (35039160).

Almost surely, 2^281391147 is an apocalyptic number.

281391147 is a deficient number, since it is larger than the sum of its proper divisors (139078773).

281391147 is a wasteful number, since it uses less digits than its factorization.

281391147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078162 (or 1078159 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 281391147 is about 16774.7174938954. The cubic root of 281391147 is about 655.2949331218.

The spelling of 281391147 in words is "two hundred eighty-one million, three hundred ninety-one thousand, one hundred forty-seven".