1556897 has 2 divisors, whose sum is σ = 1556898. Its totient is φ = 1556896.

The previous prime is 1556881. The next prime is 1556909. The reversal of 1556897 is 7986551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 844561 + 712336 = 919^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1556897 - 2⁴ = 1556881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1556837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778448 + 778449.

It is an arithmetic number, because the mean of its divisors is an integer number (778449).

2^1556897 is an apocalyptic number.

It is an amenable number.

1556897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556897 is an equidigital number, since it uses as much as digits as its factorization.

1556897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 41.

The square root of 1556897 is about 1247.7567871985. The cubic root of 1556897 is about 115.9008516646.

The spelling of 1556897 in words is "one million, five hundred fifty-six thousand, eight hundred ninety-seven".