1306690181 has 2 divisors, whose sum is σ = 1306690182. Its totient is φ = 1306690180.

The previous prime is 1306690157. The next prime is 1306690199. The reversal of 1306690181 is 1810966031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1278706081 + 27984100 = 35759^2 + 5290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306690181 - 2²² = 1302495877 is a prime.

It is a super-2 number, since 2×1306690181² = 3414878458243625522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306690111) 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, 653345090 + 653345091.

It is an arithmetic number, because the mean of its divisors is an integer number (653345091).

Almost surely, 2^1306690181 is an apocalyptic number.

It is an amenable number.

1306690181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306690181 is an equidigital number, since it uses as much as digits as its factorization.

1306690181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1306690181 is about 36148.1698153586. The cubic root of 1306690181 is about 1093.2618897790.

The spelling of 1306690181 in words is "one billion, three hundred six million, six hundred ninety thousand, one hundred eighty-one".