1196921861 has 2 divisors, whose sum is σ = 1196921862. Its totient is φ = 1196921860.

The previous prime is 1196921851. The next prime is 1196921927. The reversal of 1196921861 is 1681296911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1158108961 + 38812900 = 34031^2 + 6230^2 .

It is a cyclic number.

It is not a de Polignac number, because 1196921861 - 2¹⁴ = 1196905477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1196921821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 598460930 + 598460931.

It is an arithmetic number, because the mean of its divisors is an integer number (598460931).

Almost surely, 2^1196921861 is an apocalyptic number.

It is an amenable number.

1196921861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1196921861 is an equidigital number, since it uses as much as digits as its factorization.

1196921861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 44.

The square root of 1196921861 is about 34596.5585138175. The cubic root of 1196921861 is about 1061.7491770664.

The spelling of 1196921861 in words is "one billion, one hundred ninety-six million, nine hundred twenty-one thousand, eight hundred sixty-one".