196121869 has 2 divisors, whose sum is σ = 196121870. Its totient is φ = 196121868.

The previous prime is 196121837. The next prime is 196121881. The reversal of 196121869 is 968121691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150356644 + 45765225 = 12262^2 + 6765^2 .

It is a cyclic number.

It is not a de Polignac number, because 196121869 - 2⁵ = 196121837 is a prime.

It is a super-2 number, since 2×196121869² = 76927575000106322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196121899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98060934 + 98060935.

It is an arithmetic number, because the mean of its divisors is an integer number (98060935).

Almost surely, 2^196121869 is an apocalyptic number.

It is an amenable number.

196121869 is a deficient number, since it is larger than the sum of its proper divisors (1).

196121869 is an equidigital number, since it uses as much as digits as its factorization.

196121869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 43.

The square root of 196121869 is about 14004.3517879265. The cubic root of 196121869 is about 580.9989414240.

The spelling of 196121869 in words is "one hundred ninety-six million, one hundred twenty-one thousand, eight hundred sixty-nine".