281534009 has 2 divisors, whose sum is σ = 281534010. Its totient is φ = 281534008.

The previous prime is 281533951. The next prime is 281534027. The reversal of 281534009 is 900435182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247369984 + 34164025 = 15728^2 + 5845^2 .

It is a cyclic number.

It is not a de Polignac number, because 281534009 - 2²⁰ = 280485433 is a prime.

It is a super-2 number, since 2×281534009² = 158522796447224162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (281534509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140767004 + 140767005.

It is an arithmetic number, because the mean of its divisors is an integer number (140767005).

Almost surely, 2^281534009 is an apocalyptic number.

It is an amenable number.

281534009 is a deficient number, since it is larger than the sum of its proper divisors (1).

281534009 is an equidigital number, since it uses as much as digits as its factorization.

281534009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 281534009 is about 16778.9752070858. The cubic root of 281534009 is about 655.4058118839.

The spelling of 281534009 in words is "two hundred eighty-one million, five hundred thirty-four thousand, nine".