1557043 has 2 divisors, whose sum is σ = 1557044. Its totient is φ = 1557042.

The previous prime is 1557041. The next prime is 1557053. The reversal of 1557043 is 3407551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1557043 - 2¹ = 1557041 is a prime.

Together with 1557041, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1556999 and 1557017.

It is not a weakly prime, because it can be changed into another prime (1557041) 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, 778521 + 778522.

It is an arithmetic number, because the mean of its divisors is an integer number (778522).

2^1557043 is an apocalyptic number.

1557043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557043 is an equidigital number, since it uses as much as digits as its factorization.

1557043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 1557043 is about 1247.8152908183. The cubic root of 1557043 is about 115.9044744681.

The spelling of 1557043 in words is "one million, five hundred fifty-seven thousand, forty-three".