281201117 has 4 divisors (see below), whose sum is σ = 281489916. Its totient is φ = 280912320.

The previous prime is 281201099. The next prime is 281201153. The reversal of 281201117 is 711102182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 149548441 + 131652676 = 12229^2 + 11474^2 .

It is a cyclic number.

It is not a de Polignac number, because 281201117 - 2⁸ = 281200861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 281201092 and 281201101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281201317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142934 + ... + 144887.

It is an arithmetic number, because the mean of its divisors is an integer number (70372479).

Almost surely, 2^281201117 is an apocalyptic number.

It is an amenable number.

281201117 is a deficient number, since it is larger than the sum of its proper divisors (288799).

281201117 is an equidigital number, since it uses as much as digits as its factorization.

281201117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288798.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 281201117 is about 16769.0523584370. The cubic root of 281201117 is about 655.1473879228.

Adding to 281201117 its reverse (711102182), we get a palindrome (992303299).

The spelling of 281201117 in words is "two hundred eighty-one million, two hundred one thousand, one hundred seventeen".