1305827381 has 2 divisors, whose sum is σ = 1305827382. Its totient is φ = 1305827380.

The previous prime is 1305827377. The next prime is 1305827401. The reversal of 1305827381 is 1837285031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1274847025 + 30980356 = 35705^2 + 5566^2 .

It is an emirp because it is prime and its reverse (1837285031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1305827381 - 2² = 1305827377 is a prime.

It is a super-2 number, since 2×1305827381² = 3410370297938638322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305827351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652913690 + 652913691.

It is an arithmetic number, because the mean of its divisors is an integer number (652913691).

Almost surely, 2^1305827381 is an apocalyptic number.

It is an amenable number.

1305827381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305827381 is an equidigital number, since it uses as much as digits as its factorization.

1305827381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1305827381 is about 36136.2336305266. The cubic root of 1305827381 is about 1093.0212119556.

The spelling of 1305827381 in words is "one billion, three hundred five million, eight hundred twenty-seven thousand, three hundred eighty-one".