281157489 has 6 divisors (see below), whose sum is σ = 406116386. Its totient is φ = 187438320.

The previous prime is 281157469. The next prime is 281157491. The reversal of 281157489 is 984751182.

It can be written as a sum of positive squares in only one way, i.e., 240095025 + 41062464 = 15495^2 + 6408^2 .

It is not a de Polignac number, because 281157489 - 2⁹ = 281156977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281157419) 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 5 ways as a sum of consecutive naturals, for example, 15619852 + ... + 15619869.

Almost surely, 2^281157489 is an apocalyptic number.

It is an amenable number.

281157489 is a deficient number, since it is larger than the sum of its proper divisors (124958897).

281157489 is a wasteful number, since it uses less digits than its factorization.

281157489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31239727 (or 31239724 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 281157489 is about 16767.7514592744. The cubic root of 281157489 is about 655.1135044057.

The spelling of 281157489 in words is "two hundred eighty-one million, one hundred fifty-seven thousand, four hundred eighty-nine".