1305155381 has 2 divisors, whose sum is σ = 1305155382. Its totient is φ = 1305155380.

The previous prime is 1305155321. The next prime is 1305155389. The reversal of 1305155381 is 1835515031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1238406481 + 66748900 = 35191^2 + 8170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305155381 - 2⁶ = 1305155317 is a prime.

It is a super-2 number, since 2×1305155381² = 3406861137106510322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305155389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652577690 + 652577691.

It is an arithmetic number, because the mean of its divisors is an integer number (652577691).

Almost surely, 2^1305155381 is an apocalyptic number.

It is an amenable number.

1305155381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305155381 is an equidigital number, since it uses as much as digits as its factorization.

1305155381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 1305155381 is about 36126.9342873153. The cubic root of 1305155381 is about 1092.8336842884.

The spelling of 1305155381 in words is "one billion, three hundred five million, one hundred fifty-five thousand, three hundred eighty-one".