260415781 has 2 divisors, whose sum is σ = 260415782. Its totient is φ = 260415780.

The previous prime is 260415769. The next prime is 260415791. The reversal of 260415781 is 187514062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149450625 + 110965156 = 12225^2 + 10534^2 .

It is a cyclic number.

It is not a de Polignac number, because 260415781 - 2¹⁷ = 260284709 is a prime.

It is a super-2 number, since 2×260415781² = 135632757987679922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260415721) 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, 130207890 + 130207891.

It is an arithmetic number, because the mean of its divisors is an integer number (130207891).

Almost surely, 2^260415781 is an apocalyptic number.

It is an amenable number.

260415781 is a deficient number, since it is larger than the sum of its proper divisors (1).

260415781 is an equidigital number, since it uses as much as digits as its factorization.

260415781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 260415781 is about 16137.4031677962. The cubic root of 260415781 is about 638.5904697194.

The spelling of 260415781 in words is "two hundred sixty million, four hundred fifteen thousand, seven hundred eighty-one".