1381997 has 2 divisors, whose sum is σ = 1381998. Its totient is φ = 1381996.

The previous prime is 1381993. The next prime is 1381999. The reversal of 1381997 is 7991831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1378276 + 3721 = 1174^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381997 - 2² = 1381993 is a prime.

It is a super-3 number, since 3×1381997³ = 7918493336163941919, which contains 333 as substring.

Together with 1381999, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1381997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690998 + 690999.

It is an arithmetic number, because the mean of its divisors is an integer number (690999).

2^1381997 is an apocalyptic number.

It is an amenable number.

1381997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381997 is an equidigital number, since it uses as much as digits as its factorization.

1381997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 38.

The square root of 1381997 is about 1175.5836848136. The cubic root of 1381997 is about 111.3873059529.

The spelling of 1381997 in words is "one million, three hundred eighty-one thousand, nine hundred ninety-seven".