1306381 has 2 divisors, whose sum is σ = 1306382. Its totient is φ = 1306380.

The previous prime is 1306373. The next prime is 1306387. The reversal of 1306381 is 1836031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1121481 + 184900 = 1059^2 + 430^2 .

It is an emirp because it is prime and its reverse (1836031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1306381 - 2³ = 1306373 is a prime.

It is a super-2 number, since 2×1306381² = 3413262634322, which contains 22 as substring.

1306381 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653190 + 653191.

It is an arithmetic number, because the mean of its divisors is an integer number (653191).

2^1306381 is an apocalyptic number.

It is an amenable number.

1306381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306381 is an equidigital number, since it uses as much as digits as its factorization.

1306381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1306381 is about 1142.9702533312. The cubic root of 1306381 is about 109.3175656007.

The spelling of 1306381 in words is "one million, three hundred six thousand, three hundred eighty-one".