1557341 has 2 divisors, whose sum is σ = 1557342. Its totient is φ = 1557340.

The previous prime is 1557337. The next prime is 1557343. The reversal of 1557341 is 1437551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1331716 + 225625 = 1154^2 + 475^2 .

It is an emirp because it is prime and its reverse (1437551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1557341 - 2² = 1557337 is a prime.

Together with 1557343, 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 1557341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1557343) 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, 778670 + 778671.

It is an arithmetic number, because the mean of its divisors is an integer number (778671).

2^1557341 is an apocalyptic number.

It is an amenable number.

1557341 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557341 is an equidigital number, since it uses as much as digits as its factorization.

1557341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 26.

The square root of 1557341 is about 1247.9346938041. The cubic root of 1557341 is about 115.9118682545.

The spelling of 1557341 in words is "one million, five hundred fifty-seven thousand, three hundred forty-one".