281079961 has 2 divisors, whose sum is σ = 281079962. Its totient is φ = 281079960.

The previous prime is 281079937. The next prime is 281080027. The reversal of 281079961 is 169970182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 274929561 + 6150400 = 16581^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 281079961 - 2⁷ = 281079833 is a prime.

It is not a weakly prime, because it can be changed into another prime (281079761) 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, 140539980 + 140539981.

It is an arithmetic number, because the mean of its divisors is an integer number (140539981).

Almost surely, 2^281079961 is an apocalyptic number.

It is an amenable number.

281079961 is a deficient number, since it is larger than the sum of its proper divisors (1).

281079961 is an equidigital number, since it uses as much as digits as its factorization.

281079961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 281079961 is about 16765.4394812662. The cubic root of 281079961 is about 655.0532839352.

The spelling of 281079961 in words is "two hundred eighty-one million, seventy-nine thousand, nine hundred sixty-one".