1085809877 has 2 divisors, whose sum is σ = 1085809878. Its totient is φ = 1085809876.

The previous prime is 1085809871. The next prime is 1085809903. The reversal of 1085809877 is 7789085801.

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., 1044000721 + 41809156 = 32311^2 + 6466^2 .

It is a cyclic number.

It is not a de Polignac number, because 1085809877 - 2⁴ = 1085809861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1085809871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542904938 + 542904939.

It is an arithmetic number, because the mean of its divisors is an integer number (542904939).

Almost surely, 2^1085809877 is an apocalyptic number.

It is an amenable number.

1085809877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085809877 is an equidigital number, since it uses as much as digits as its factorization.

1085809877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128960, while the sum is 53.

The square root of 1085809877 is about 32951.6293527346. The cubic root of 1085809877 is about 1027.8220473134.

The spelling of 1085809877 in words is "one billion, eighty-five million, eight hundred nine thousand, eight hundred seventy-seven".