281912087 has 2 divisors, whose sum is σ = 281912088. Its totient is φ = 281912086.

The previous prime is 281912083. The next prime is 281912119. The reversal of 281912087 is 780219182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281912087 - 2² = 281912083 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 281912087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281912083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140956043 + 140956044.

It is an arithmetic number, because the mean of its divisors is an integer number (140956044).

Almost surely, 2^281912087 is an apocalyptic number.

281912087 is a deficient number, since it is larger than the sum of its proper divisors (1).

281912087 is an equidigital number, since it uses as much as digits as its factorization.

281912087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 281912087 is about 16790.2378482260. The cubic root of 281912087 is about 655.6990667785.

The spelling of 281912087 in words is "two hundred eighty-one million, nine hundred twelve thousand, eighty-seven".