281006399 has 2 divisors, whose sum is σ = 281006400. Its totient is φ = 281006398.

The previous prime is 281006393. The next prime is 281006417. The reversal of 281006399 is 993600182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281006399 - 2²⁰ = 279957823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281006393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140503199 + 140503200.

It is an arithmetic number, because the mean of its divisors is an integer number (140503200).

Almost surely, 2^281006399 is an apocalyptic number.

281006399 is a deficient number, since it is larger than the sum of its proper divisors (1).

281006399 is an equidigital number, since it uses as much as digits as its factorization.

281006399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 281006399 is about 16763.2454793217. The cubic root of 281006399 is about 654.9961338466.

The spelling of 281006399 in words is "two hundred eighty-one million, six thousand, three hundred ninety-nine".