281924381 has 2 divisors, whose sum is σ = 281924382. Its totient is φ = 281924380.

The previous prime is 281924359. The next prime is 281924417. The reversal of 281924381 is 183429182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161671225 + 120253156 = 12715^2 + 10966^2 .

It is a cyclic number.

It is not a de Polignac number, because 281924381 - 2¹⁸ = 281662237 is a prime.

It is a super-2 number, since 2×281924381² = 158962713204466322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281924351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140962190 + 140962191.

It is an arithmetic number, because the mean of its divisors is an integer number (140962191).

Almost surely, 2^281924381 is an apocalyptic number.

It is an amenable number.

281924381 is a deficient number, since it is larger than the sum of its proper divisors (1).

281924381 is an equidigital number, since it uses as much as digits as its factorization.

281924381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 281924381 is about 16790.6039498286. The cubic root of 281924381 is about 655.7085981744.

The spelling of 281924381 in words is "two hundred eighty-one million, nine hundred twenty-four thousand, three hundred eighty-one".