1027805861 has 2 divisors, whose sum is σ = 1027805862. Its totient is φ = 1027805860.

The previous prime is 1027805843. The next prime is 1027805903. The reversal of 1027805861 is 1685087201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591413761 + 436392100 = 24319^2 + 20890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1027805861 - 2⁶ = 1027805797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1027805161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 513902930 + 513902931.

It is an arithmetic number, because the mean of its divisors is an integer number (513902931).

Almost surely, 2^1027805861 is an apocalyptic number.

It is an amenable number.

1027805861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1027805861 is an equidigital number, since it uses as much as digits as its factorization.

1027805861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 1027805861 is about 32059.4114262879. The cubic root of 1027805861 is about 1009.1840159718.

The spelling of 1027805861 in words is "one billion, twenty-seven million, eight hundred five thousand, eight hundred sixty-one".