281331601 has 2 divisors, whose sum is σ = 281331602. Its totient is φ = 281331600.

The previous prime is 281331551. The next prime is 281331641. The reversal of 281331601 is 106133182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243828225 + 37503376 = 15615^2 + 6124^2 .

It is a cyclic number.

It is not a de Polignac number, because 281331601 - 2¹⁵ = 281298833 is a prime.

It is not a weakly prime, because it can be changed into another prime (281331641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140665800 + 140665801.

It is an arithmetic number, because the mean of its divisors is an integer number (140665801).

Almost surely, 2^281331601 is an apocalyptic number.

It is an amenable number.

281331601 is a deficient number, since it is larger than the sum of its proper divisors (1).

281331601 is an equidigital number, since it uses as much as digits as its factorization.

281331601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 281331601 is about 16772.9425265813. The cubic root of 281331601 is about 655.2487069046.

Adding to 281331601 its reverse (106133182), we get a palindrome (387464783).

The spelling of 281331601 in words is "two hundred eighty-one million, three hundred thirty-one thousand, six hundred one".