281325005 has 18 divisors (see below), whose sum is σ = 366190686. Its totient is φ = 207387648.

The previous prime is 281324987. The next prime is 281325013. The reversal of 281325005 is 500523182.

It can be written as a sum of positive squares in 9 ways, for example, as 6461764 + 274863241 = 2542^2 + 16579^2 .

It is not a de Polignac number, because 281325005 - 2⁶ = 281324941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 487277 + ... + 487853.

It is an arithmetic number, because the mean of its divisors is an integer number (20343927).

Almost surely, 2^281325005 is an apocalyptic number.

It is an amenable number.

281325005 is a deficient number, since it is larger than the sum of its proper divisors (84865681).

281325005 is an frugal number, since it uses more digits than its factorization.

281325005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 281325005 is about 16772.7458992259. The cubic root of 281325005 is about 655.2435859558.

Adding to 281325005 its reverse (500523182), we get a palindrome (781848187).

The spelling of 281325005 in words is "two hundred eighty-one million, three hundred twenty-five thousand, five".