260347981 has 2 divisors, whose sum is σ = 260347982. Its totient is φ = 260347980.

The previous prime is 260347963. The next prime is 260348027. The reversal of 260347981 is 189743062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260305956 + 42025 = 16134^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 260347981 - 2⁵ = 260347949 is a prime.

It is a super-2 number, since 2×260347981² = 135562142421552722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260347931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130173990 + 130173991.

It is an arithmetic number, because the mean of its divisors is an integer number (130173991).

Almost surely, 2^260347981 is an apocalyptic number.

It is an amenable number.

260347981 is a deficient number, since it is larger than the sum of its proper divisors (1).

260347981 is an equidigital number, since it uses as much as digits as its factorization.

260347981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 260347981 is about 16135.3023213078. The cubic root of 260347981 is about 638.5350452854.

The spelling of 260347981 in words is "two hundred sixty million, three hundred forty-seven thousand, nine hundred eighty-one".