1305389131 has 2 divisors, whose sum is σ = 1305389132. Its totient is φ = 1305389130.

The previous prime is 1305389117. The next prime is 1305389147. The reversal of 1305389131 is 1319835031.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1305389131 is a prime.

It is a super-2 number, since 2×1305389131² = 3408081566665870322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1305389831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652694565 + 652694566.

It is an arithmetic number, because the mean of its divisors is an integer number (652694566).

Almost surely, 2^1305389131 is an apocalyptic number.

1305389131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305389131 is an equidigital number, since it uses as much as digits as its factorization.

1305389131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1305389131 is about 36130.1692633732. The cubic root of 1305389131 is about 1092.8989216358.

The spelling of 1305389131 in words is "one billion, three hundred five million, three hundred eighty-nine thousand, one hundred thirty-one".