281973413 has 4 divisors (see below), whose sum is σ = 283769580. Its totient is φ = 280177248.

The previous prime is 281973397. The next prime is 281973421. The reversal of 281973413 is 314379182.

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

It can be written as a sum of positive squares in 2 ways, for example, as 136843204 + 145130209 = 11698^2 + 12047^2 .

It is a cyclic number.

It is not a de Polignac number, because 281973413 - 2⁴ = 281973397 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 (281973463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897848 + ... + 898161.

It is an arithmetic number, because the mean of its divisors is an integer number (70942395).

Almost surely, 2^281973413 is an apocalyptic number.

It is an amenable number.

281973413 is a deficient number, since it is larger than the sum of its proper divisors (1796167).

281973413 is a wasteful number, since it uses less digits than its factorization.

281973413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796166.

The product of its digits is 36288, while the sum is 38.

The square root of 281973413 is about 16792.0639886823. The cubic root of 281973413 is about 655.7466093605.

The spelling of 281973413 in words is "two hundred eighty-one million, nine hundred seventy-three thousand, four hundred thirteen".