1197632981 has 4 divisors (see below), whose sum is σ = 1238930700. Its totient is φ = 1156335264.

The previous prime is 1197632941. The next prime is 1197632999. The reversal of 1197632981 is 1892367911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 965344900 + 232288081 = 31070^2 + 15241^2 .

It is a cyclic number.

It is not a de Polignac number, because 1197632981 - 2¹⁴ = 1197616597 is a prime.

It is a super-2 number, since 2×1197632981² = 2868649514357892722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1197632921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20648816 + ... + 20648873.

It is an arithmetic number, because the mean of its divisors is an integer number (309732675).

Almost surely, 2^1197632981 is an apocalyptic number.

It is an amenable number.

1197632981 is a deficient number, since it is larger than the sum of its proper divisors (41297719).

1197632981 is an equidigital number, since it uses as much as digits as its factorization.

1197632981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41297718.

The product of its digits is 163296, while the sum is 47.

The square root of 1197632981 is about 34606.8343105809. The cubic root of 1197632981 is about 1061.9594056595.

The spelling of 1197632981 in words is "one billion, one hundred ninety-seven million, six hundred thirty-two thousand, nine hundred eighty-one".