1305500505091 has 2 divisors, whose sum is σ = 1305500505092. Its totient is φ = 1305500505090.

The previous prime is 1305500505083. The next prime is 1305500505131. The reversal of 1305500505091 is 1905050055031.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1305500505091 - 2³ = 1305500505083 is a prime.

It is a super-2 number, since 2×1305500505091² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1305500502091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652750252545 + 652750252546.

It is an arithmetic number, because the mean of its divisors is an integer number (652750252546).

Almost surely, 2^{1305500505091} is an apocalyptic number.

1305500505091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305500505091 is an equidigital number, since it uses as much as digits as its factorization.

1305500505091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16875, while the sum is 34.

The spelling of 1305500505091 in words is "one trillion, three hundred five billion, five hundred million, five hundred five thousand, ninety-one".