281601997 has 2 divisors, whose sum is σ = 281601998. Its totient is φ = 281601996.

The previous prime is 281601941. The next prime is 281602001. The reversal of 281601997 is 799106182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281601961 + 36 = 16781^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 281601997 - 2¹¹ = 281599949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281601937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140800998 + 140800999.

It is an arithmetic number, because the mean of its divisors is an integer number (140800999).

Almost surely, 2^281601997 is an apocalyptic number.

It is an amenable number.

281601997 is a deficient number, since it is larger than the sum of its proper divisors (1).

281601997 is an equidigital number, since it uses as much as digits as its factorization.

281601997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 281601997 is about 16781.0010726416. The cubic root of 281601997 is about 655.4585658941.

The spelling of 281601997 in words is "two hundred eighty-one million, six hundred one thousand, nine hundred ninety-seven".