281964973 has 2 divisors, whose sum is σ = 281964974. Its totient is φ = 281964972.

The previous prime is 281964961. The next prime is 281964989. The reversal of 281964973 is 379469182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281803369 + 161604 = 16787^2 + 402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281964973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281964773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140982486 + 140982487.

It is an arithmetic number, because the mean of its divisors is an integer number (140982487).

Almost surely, 2^281964973 is an apocalyptic number.

It is an amenable number.

281964973 is a deficient number, since it is larger than the sum of its proper divisors (1).

281964973 is an equidigital number, since it uses as much as digits as its factorization.

281964973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 281964973 is about 16791.8126776117. The cubic root of 281964973 is about 655.7400667146.

The spelling of 281964973 in words is "two hundred eighty-one million, nine hundred sixty-four thousand, nine hundred seventy-three".