1556117 has 2 divisors, whose sum is σ = 1556118. Its totient is φ = 1556116.

The previous prime is 1556083. The next prime is 1556147. The reversal of 1556117 is 7116551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1164241 + 391876 = 1079^2 + 626^2 .

It is a cyclic number.

It is not a de Polignac number, because 1556117 - 2⁸ = 1555861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1556147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778058 + 778059.

It is an arithmetic number, because the mean of its divisors is an integer number (778059).

2^1556117 is an apocalyptic number.

It is an amenable number.

1556117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556117 is an equidigital number, since it uses as much as digits as its factorization.

1556117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1050, while the sum is 26.

The square root of 1556117 is about 1247.4441871282. Note that the first 3 decimals coincide. The cubic root of 1556117 is about 115.8814931231.

The spelling of 1556117 in words is "one million, five hundred fifty-six thousand, one hundred seventeen".