281204993433989 has 2 divisors, whose sum is σ = 281204993433990. Its totient is φ = 281204993433988.

The previous prime is 281204993433907. The next prime is 281204993434033. The reversal of 281204993433989 is 989334399402182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247267762562500 + 33937230871489 = 15724750^2 + 5825567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281204993433989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281204993433389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140602496716994 + 140602496716995.

It is an arithmetic number, because the mean of its divisors is an integer number (140602496716995).

Almost surely, 2^{281204993433989} is an apocalyptic number.

It is an amenable number.

281204993433989 is a deficient number, since it is larger than the sum of its proper divisors (1).

281204993433989 is an equidigital number, since it uses as much as digits as its factorization.

281204993433989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725594112, while the sum is 74.

The spelling of 281204993433989 in words is "two hundred eighty-one trillion, two hundred four billion, nine hundred ninety-three million, four hundred thirty-three thousand, nine hundred eighty-nine".