196180781 has 2 divisors, whose sum is σ = 196180782. Its totient is φ = 196180780.

The previous prime is 196180727. The next prime is 196180783. The reversal of 196180781 is 187081691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103347556 + 92833225 = 10166^2 + 9635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196180781 is a prime.

It is a super-2 number, since 2×196180781² = 76973797667539922, which contains 22 as substring.

Together with 196180783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196180783) 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 as a sum of consecutive naturals, namely, 98090390 + 98090391.

It is an arithmetic number, because the mean of its divisors is an integer number (98090391).

Almost surely, 2^196180781 is an apocalyptic number.

It is an amenable number.

196180781 is a deficient number, since it is larger than the sum of its proper divisors (1).

196180781 is an equidigital number, since it uses as much as digits as its factorization.

196180781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 41.

The square root of 196180781 is about 14006.4549761887. The cubic root of 196180781 is about 581.0571099889.

The spelling of 196180781 in words is "one hundred ninety-six million, one hundred eighty thousand, seven hundred eighty-one".