196156381 has 2 divisors, whose sum is σ = 196156382. Its totient is φ = 196156380.

The previous prime is 196156357. The next prime is 196156439. The reversal of 196156381 is 183651691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165353881 + 30802500 = 12859^2 + 5550^2 .

It is an emirp because it is prime and its reverse (183651691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 196156381 - 2⁵ = 196156349 is a prime.

It is a super-2 number, since 2×196156381² = 76954651614034322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196156981) 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, 98078190 + 98078191.

It is an arithmetic number, because the mean of its divisors is an integer number (98078191).

Almost surely, 2^196156381 is an apocalyptic number.

It is an amenable number.

196156381 is a deficient number, since it is larger than the sum of its proper divisors (1).

196156381 is an equidigital number, since it uses as much as digits as its factorization.

196156381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 196156381 is about 14005.5839221362. The cubic root of 196156381 is about 581.0330193156.

The spelling of 196156381 in words is "one hundred ninety-six million, one hundred fifty-six thousand, three hundred eighty-one".