260047721 has 2 divisors, whose sum is σ = 260047722. Its totient is φ = 260047720.

The previous prime is 260047717. The next prime is 260047787. The reversal of 260047721 is 127740062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142086400 + 117961321 = 11920^2 + 10861^2 .

It is a cyclic number.

It is not a de Polignac number, because 260047721 - 2² = 260047717 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (260017721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130023860 + 130023861.

It is an arithmetic number, because the mean of its divisors is an integer number (130023861).

Almost surely, 2^260047721 is an apocalyptic number.

It is an amenable number.

260047721 is a deficient number, since it is larger than the sum of its proper divisors (1).

260047721 is an equidigital number, since it uses as much as digits as its factorization.

260047721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 260047721 is about 16125.9951940958. The cubic root of 260047721 is about 638.2894761495.

Adding to 260047721 its reverse (127740062), we get a palindrome (387787783).

The spelling of 260047721 in words is "two hundred sixty million, forty-seven thousand, seven hundred twenty-one".