1381381 has 2 divisors, whose sum is σ = 1381382. Its totient is φ = 1381380.

The previous prime is 1381349. The next prime is 1381397. The reversal of 1381381 is 1831831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1136356 + 245025 = 1066^2 + 495^2 .

It is an emirp because it is prime and its reverse (1831831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1381381 - 2⁵ = 1381349 is a prime.

It is a super-2 number, since 2×1381381² = 3816426934322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1388381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690690 + 690691.

It is an arithmetic number, because the mean of its divisors is an integer number (690691).

2^1381381 is an apocalyptic number.

It is an amenable number.

1381381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381381 is an equidigital number, since it uses as much as digits as its factorization.

1381381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 1381381 is about 1175.3216581005. The cubic root of 1381381 is about 111.3707538722.

The spelling of 1381381 in words is "one million, three hundred eighty-one thousand, three hundred eighty-one".