1371661 has 2 divisors, whose sum is σ = 1371662. Its totient is φ = 1371660.

The previous prime is 1371653. The next prime is 1371683. The reversal of 1371661 is 1661731.

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., 1334025 + 37636 = 1155^2 + 194^2 .

It is an emirp because it is prime and its reverse (1661731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1371661 - 2³ = 1371653 is a prime.

It is a super-3 number, since 3×1371661³ = 7742150809343633343, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1371641) 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, 685830 + 685831.

It is an arithmetic number, because the mean of its divisors is an integer number (685831).

2^1371661 is an apocalyptic number.

It is an amenable number.

1371661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371661 is an equidigital number, since it uses as much as digits as its factorization.

1371661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 25.

The square root of 1371661 is about 1171.1793201726. The cubic root of 1371661 is about 111.1089210309.

The spelling of 1371661 in words is "one million, three hundred seventy-one thousand, six hundred sixty-one".