281249413 has 2 divisors, whose sum is σ = 281249414. Its totient is φ = 281249412.

The previous prime is 281249383. The next prime is 281249417. The reversal of 281249413 is 314942182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261695329 + 19554084 = 16177^2 + 4422^2 .

It is a cyclic number.

It is not a de Polignac number, because 281249413 - 2¹³ = 281241221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281249417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140624706 + 140624707.

It is an arithmetic number, because the mean of its divisors is an integer number (140624707).

Almost surely, 2^281249413 is an apocalyptic number.

It is an amenable number.

281249413 is a deficient number, since it is larger than the sum of its proper divisors (1).

281249413 is an equidigital number, since it uses as much as digits as its factorization.

281249413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

The square root of 281249413 is about 16770.4923302806. The cubic root of 281249413 is about 655.1848927370.

It can be divided in two parts, 2812 and 49413, that added together give a palindrome (52225).

The spelling of 281249413 in words is "two hundred eighty-one million, two hundred forty-nine thousand, four hundred thirteen".