281030381 has 2 divisors, whose sum is σ = 281030382. Its totient is φ = 281030380.

The previous prime is 281030377. The next prime is 281030401. The reversal of 281030381 is 183030182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160250281 + 120780100 = 12659^2 + 10990^2 .

It is a cyclic number.

It is not a de Polignac number, because 281030381 - 2² = 281030377 is a prime.

It is a super-2 number, since 2×281030381² = 157956150090010322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 281030381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281030371) 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 as a sum of consecutive naturals, namely, 140515190 + 140515191.

It is an arithmetic number, because the mean of its divisors is an integer number (140515191).

Almost surely, 2^281030381 is an apocalyptic number.

It is an amenable number.

281030381 is a deficient number, since it is larger than the sum of its proper divisors (1).

281030381 is an equidigital number, since it uses as much as digits as its factorization.

281030381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 281030381 is about 16763.9607790045. The cubic root of 281030381 is about 655.0147664833.

The spelling of 281030381 in words is "two hundred eighty-one million, thirty thousand, three hundred eighty-one".