1085555897 has 2 divisors, whose sum is σ = 1085555898. Its totient is φ = 1085555896.

The previous prime is 1085555879. The next prime is 1085555903. The reversal of 1085555897 is 7985555801.

Together with previous prime (1085555879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792084736 + 293471161 = 28144^2 + 17131^2 .

It is an emirp because it is prime and its reverse (7985555801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1085555897 - 2³⁰ = 11814073 is a prime.

It is a super-2 number, since 2×1085555897² = 2356863211022949218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1085551897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542777948 + 542777949.

It is an arithmetic number, because the mean of its divisors is an integer number (542777949).

Almost surely, 2^1085555897 is an apocalyptic number.

It is an amenable number.

1085555897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085555897 is an equidigital number, since it uses as much as digits as its factorization.

1085555897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520000, while the sum is 53.

The square root of 1085555897 is about 32947.7752966722. The cubic root of 1085555897 is about 1027.7419023435.

The spelling of 1085555897 in words is "one billion, eighty-five million, five hundred fifty-five thousand, eight hundred ninety-seven".