196521181 has 2 divisors, whose sum is σ = 196521182. Its totient is φ = 196521180.

The previous prime is 196521151. The next prime is 196521209. The reversal of 196521181 is 181125691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196280100 + 241081 = 14010^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 196521181 - 2⁹ = 196520669 is a prime.

It is a super-2 number, since 2×196521181² = 77241149163269522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196521151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98260590 + 98260591.

It is an arithmetic number, because the mean of its divisors is an integer number (98260591).

Almost surely, 2^196521181 is an apocalyptic number.

It is an amenable number.

196521181 is a deficient number, since it is larger than the sum of its proper divisors (1).

196521181 is an equidigital number, since it uses as much as digits as its factorization.

196521181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 34.

The square root of 196521181 is about 14018.6012497681. The cubic root of 196521181 is about 581.3929865053.

The spelling of 196521181 in words is "one hundred ninety-six million, five hundred twenty-one thousand, one hundred eighty-one".