260140721 has 2 divisors, whose sum is σ = 260140722. Its totient is φ = 260140720.

The previous prime is 260140703. The next prime is 260140729. The reversal of 260140721 is 127041062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257923600 + 2217121 = 16060^2 + 1489^2 .

It is a cyclic number.

It is not a de Polignac number, because 260140721 - 2²² = 255946417 is a prime.

It is not a weakly prime, because it can be changed into another prime (260140729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130070360 + 130070361.

It is an arithmetic number, because the mean of its divisors is an integer number (130070361).

Almost surely, 2^260140721 is an apocalyptic number.

It is an amenable number.

260140721 is a deficient number, since it is larger than the sum of its proper divisors (1).

260140721 is an equidigital number, since it uses as much as digits as its factorization.

260140721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 260140721 is about 16128.8784792992. The cubic root of 260140721 is about 638.3655568602.

Adding to 260140721 its reverse (127041062), we get a palindrome (387181783).

The spelling of 260140721 in words is "two hundred sixty million, one hundred forty thousand, seven hundred twenty-one".