281964987 has 6 divisors (see below), whose sum is σ = 407282772. Its totient is φ = 187976652.

The previous prime is 281964973. The next prime is 281964989. The reversal of 281964987 is 789469182.

It is not a de Polignac number, because 281964987 - 2¹² = 281960891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (281964989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15664713 + ... + 15664730.

It is an arithmetic number, because the mean of its divisors is an integer number (67880462).

Almost surely, 2^281964987 is an apocalyptic number.

281964987 is a deficient number, since it is larger than the sum of its proper divisors (125317785).

281964987 is a wasteful number, since it uses less digits than its factorization.

281964987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31329449 (or 31329446 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 281964987 is about 16791.8130944815. The cubic root of 281964987 is about 655.7400775674.

The spelling of 281964987 in words is "two hundred eighty-one million, nine hundred sixty-four thousand, nine hundred eighty-seven".