281385087 has 4 divisors (see below), whose sum is σ = 375180120. Its totient is φ = 187590056.

The previous prime is 281385053. The next prime is 281385113. The reversal of 281385087 is 780583182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 281385087 - 2¹⁰ = 281384063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281385007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46897512 + ... + 46897517.

It is an arithmetic number, because the mean of its divisors is an integer number (93795030).

Almost surely, 2^281385087 is an apocalyptic number.

281385087 is a deficient number, since it is larger than the sum of its proper divisors (93795033).

281385087 is an equidigital number, since it uses as much as digits as its factorization.

281385087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93795032.

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 281385087 is about 16774.5368639495. The cubic root of 281385087 is about 655.2902289750.

The spelling of 281385087 in words is "two hundred eighty-one million, three hundred eighty-five thousand, eighty-seven".