1195880981 has 2 divisors, whose sum is σ = 1195880982. Its totient is φ = 1195880980.

The previous prime is 1195880969. The next prime is 1195880999. The reversal of 1195880981 is 1890885911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663886756 + 531994225 = 25766^2 + 23065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1195880981 - 2¹⁰ = 1195879957 is a prime.

It is a super-2 number, since 2×1195880981² = 2860262641435044722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1195880951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 597940490 + 597940491.

It is an arithmetic number, because the mean of its divisors is an integer number (597940491).

Almost surely, 2^1195880981 is an apocalyptic number.

It is an amenable number.

1195880981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1195880981 is an equidigital number, since it uses as much as digits as its factorization.

1195880981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 50.

The square root of 1195880981 is about 34581.5121271468. The cubic root of 1195880981 is about 1061.4413112447.

The spelling of 1195880981 in words is "one billion, one hundred ninety-five million, eight hundred eighty thousand, nine hundred eighty-one".