281420981 has 2 divisors, whose sum is σ = 281420982. Its totient is φ = 281420980.

The previous prime is 281420977. The next prime is 281420983. The reversal of 281420981 is 189024182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146652100 + 134768881 = 12110^2 + 11609^2 .

It is a cyclic number.

It is not a de Polignac number, because 281420981 - 2² = 281420977 is a prime.

It is a super-2 number, since 2×281420981² = 158395537094004722, which contains 22 as substring.

Together with 281420983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281420983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140710490 + 140710491.

It is an arithmetic number, because the mean of its divisors is an integer number (140710491).

Almost surely, 2^281420981 is an apocalyptic number.

It is an amenable number.

281420981 is a deficient number, since it is larger than the sum of its proper divisors (1).

281420981 is an equidigital number, since it uses as much as digits as its factorization.

281420981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 281420981 is about 16775.6067252425. The cubic root of 281420981 is about 655.3180911332.

The spelling of 281420981 in words is "two hundred eighty-one million, four hundred twenty thousand, nine hundred eighty-one".