1305971111 has 2 divisors, whose sum is σ = 1305971112. Its totient is φ = 1305971110.

The previous prime is 1305971087. The next prime is 1305971113. The reversal of 1305971111 is 1111795031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1305971111 - 2¹⁰ = 1305970087 is a prime.

Together with 1305971113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305971113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652985555 + 652985556.

It is an arithmetic number, because the mean of its divisors is an integer number (652985556).

Almost surely, 2^1305971111 is an apocalyptic number.

1305971111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305971111 is an equidigital number, since it uses as much as digits as its factorization.

1305971111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 945, while the sum is 29.

The square root of 1305971111 is about 36138.2222999417. Note that the first 4 decimals coincide. The cubic root of 1305971111 is about 1093.0613127575.

The spelling of 1305971111 in words is "one billion, three hundred five million, nine hundred seventy-one thousand, one hundred eleven".