1085557061 has 2 divisors, whose sum is σ = 1085557062. Its totient is φ = 1085557060.

The previous prime is 1085557043. The next prime is 1085557103. The reversal of 1085557061 is 1607555801.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 898140961 + 187416100 = 29969^2 + 13690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1085557061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1085553061) 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, 542778530 + 542778531.

It is an arithmetic number, because the mean of its divisors is an integer number (542778531).

Almost surely, 2^1085557061 is an apocalyptic number.

It is an amenable number.

1085557061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085557061 is an equidigital number, since it uses as much as digits as its factorization.

1085557061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42000, while the sum is 38.

The square root of 1085557061 is about 32947.7929609860. The cubic root of 1085557061 is about 1027.7422696794.

The spelling of 1085557061 in words is "one billion, eighty-five million, five hundred fifty-seven thousand, sixty-one".