1197866861 has 2 divisors, whose sum is σ = 1197866862. Its totient is φ = 1197866860.

The previous prime is 1197866851. The next prime is 1197866893. The reversal of 1197866861 is 1686687911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1077086761 + 120780100 = 32819^2 + 10990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1197866861 - 2²⁶ = 1130757997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1197866851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 598933430 + 598933431.

It is an arithmetic number, because the mean of its divisors is an integer number (598933431).

Almost surely, 2^1197866861 is an apocalyptic number.

It is an amenable number.

1197866861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1197866861 is an equidigital number, since it uses as much as digits as its factorization.

1197866861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 1197866861 is about 34610.2132469593. The cubic root of 1197866861 is about 1062.0285294795.

The spelling of 1197866861 in words is "one billion, one hundred ninety-seven million, eight hundred sixty-six thousand, eight hundred sixty-one".