1556955089 has 2 divisors, whose sum is σ = 1556955090. Its totient is φ = 1556955088.

The previous prime is 1556955061. The next prime is 1556955121. The reversal of 1556955089 is 9805596551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1556697025 + 258064 = 39455^2 + 508^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1556955089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1556955089.

It is not a weakly prime, because it can be changed into another prime (1556955289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778477544 + 778477545.

It is an arithmetic number, because the mean of its divisors is an integer number (778477545).

Almost surely, 2^1556955089 is an apocalyptic number.

It is an amenable number.

1556955089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556955089 is an equidigital number, since it uses as much as digits as its factorization.

1556955089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430000, while the sum is 53.

The square root of 1556955089 is about 39458.2702231104. The cubic root of 1556955089 is about 1159.0229309608.

The spelling of 1556955089 in words is "one billion, five hundred fifty-six million, nine hundred fifty-five thousand, eighty-nine".