197512813181 has 2 divisors, whose sum is σ = 197512813182. Its totient is φ = 197512813180.

The previous prime is 197512813171. The next prime is 197512813189. The reversal of 197512813181 is 181318215791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114765112900 + 82747700281 = 338770^2 + 287659^2 .

It is a cyclic number.

It is not a de Polignac number, because 197512813181 - 2²² = 197508618877 is a prime.

It is a super-2 number, since 2×197512813181² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197512813189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98756406590 + 98756406591.

It is an arithmetic number, because the mean of its divisors is an integer number (98756406591).

Almost surely, 2^197512813181 is an apocalyptic number.

It is an amenable number.

197512813181 is a deficient number, since it is larger than the sum of its proper divisors (1).

197512813181 is an equidigital number, since it uses as much as digits as its factorization.

197512813181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 47.

The spelling of 197512813181 in words is "one hundred ninety-seven billion, five hundred twelve million, eight hundred thirteen thousand, one hundred eighty-one".