281964961 has 2 divisors, whose sum is σ = 281964962. Its totient is φ = 281964960.

The previous prime is 281964937. The next prime is 281964973. The reversal of 281964961 is 169469182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182763361 + 99201600 = 13519^2 + 9960^2 .

It is a cyclic number.

It is not a de Polignac number, because 281964961 - 2⁷ = 281964833 is a prime.

It is not a weakly prime, because it can be changed into another prime (281964911) 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, 140982480 + 140982481.

It is an arithmetic number, because the mean of its divisors is an integer number (140982481).

Almost surely, 2^281964961 is an apocalyptic number.

It is an amenable number.

281964961 is a deficient number, since it is larger than the sum of its proper divisors (1).

281964961 is an equidigital number, since it uses as much as digits as its factorization.

281964961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 281964961 is about 16791.8123202947. The cubic root of 281964961 is about 655.7400574121.

The spelling of 281964961 in words is "two hundred eighty-one million, nine hundred sixty-four thousand, nine hundred sixty-one".