196191137981 has 2 divisors, whose sum is σ = 196191137982. Its totient is φ = 196191137980.

The previous prime is 196191137963. The next prime is 196191138041. The reversal of 196191137981 is 189731191691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170994655225 + 25196482756 = 413515^2 + 158734^2 .

It is a cyclic number.

It is not a de Polignac number, because 196191137981 - 2⁶ = 196191137917 is a prime.

It is a super-2 number, since 2×196191137981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196191133981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98095568990 + 98095568991.

It is an arithmetic number, because the mean of its divisors is an integer number (98095568991).

Almost surely, 2^196191137981 is an apocalyptic number.

It is an amenable number.

196191137981 is a deficient number, since it is larger than the sum of its proper divisors (1).

196191137981 is an equidigital number, since it uses as much as digits as its factorization.

196191137981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 56.

The spelling of 196191137981 in words is "one hundred ninety-six billion, one hundred ninety-one million, one hundred thirty-seven thousand, nine hundred eighty-one".