281080109 has 2 divisors, whose sum is σ = 281080110. Its totient is φ = 281080108.

The previous prime is 281080103. The next prime is 281080117. The reversal of 281080109 is 901080182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281065225 + 14884 = 16765^2 + 122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281080109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_15281615 and since 281080109 and 15281615 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281080103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140540054 + 140540055.

It is an arithmetic number, because the mean of its divisors is an integer number (140540055).

Almost surely, 2^281080109 is an apocalyptic number.

It is an amenable number.

281080109 is a deficient number, since it is larger than the sum of its proper divisors (1).

281080109 is an equidigital number, since it uses as much as digits as its factorization.

281080109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 281080109 is about 16765.4438951076. The cubic root of 281080109 is about 655.0533989059.

The spelling of 281080109 in words is "two hundred eighty-one million, eighty thousand, one hundred nine".