281299987 has 2 divisors, whose sum is σ = 281299988. Its totient is φ = 281299986.

The previous prime is 281299981. The next prime is 281300017. The reversal of 281299987 is 789992182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281299987 - 2³ = 281299979 is a prime.

It is not a weakly prime, because it can be changed into another prime (281299981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140649993 + 140649994.

It is an arithmetic number, because the mean of its divisors is an integer number (140649994).

Almost surely, 2^281299987 is an apocalyptic number.

281299987 is a deficient number, since it is larger than the sum of its proper divisors (1).

281299987 is an equidigital number, since it uses as much as digits as its factorization.

281299987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 55.

The square root of 281299987 is about 16772.0000894348. Note that the first 4 decimals coincide. The cubic root of 281299987 is about 655.2241619566.

The spelling of 281299987 in words is "two hundred eighty-one million, two hundred ninety-nine thousand, nine hundred eighty-seven".