281401247 has 4 divisors (see below), whose sum is σ = 282663360. Its totient is φ = 280139136.

The previous prime is 281401223. The next prime is 281401249. The reversal of 281401247 is 742104182.

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 281401247 - 2²⁸ = 12965791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281401249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630722 + ... + 631167.

It is an arithmetic number, because the mean of its divisors is an integer number (70665840).

Almost surely, 2^281401247 is an apocalyptic number.

281401247 is a deficient number, since it is larger than the sum of its proper divisors (1262113).

281401247 is a wasteful number, since it uses less digits than its factorization.

281401247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262112.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 281401247 is about 16775.0185394830. The cubic root of 281401247 is about 655.3027732164.

The spelling of 281401247 in words is "two hundred eighty-one million, four hundred one thousand, two hundred forty-seven".