197557081 has 2 divisors, whose sum is σ = 197557082. Its totient is φ = 197557080.

The previous prime is 197557069. The next prime is 197557091. The reversal of 197557081 is 180755791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157753600 + 39803481 = 12560^2 + 6309^2 .

It is an emirp because it is prime and its reverse (180755791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197557081 - 2⁵ = 197557049 is a prime.

It is a super-2 number, since 2×197557081² = 78057600506481122, which contains 22 as substring.

It is the 14056-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (197557001) by changing a digit.

It is a nontrivial repunit in base 14055.

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, 98778540 + 98778541.

It is an arithmetic number, because the mean of its divisors is an integer number (98778541).

Almost surely, 2^197557081 is an apocalyptic number.

It is an amenable number.

197557081 is a deficient number, since it is larger than the sum of its proper divisors (1).

197557081 is an equidigital number, since it uses as much as digits as its factorization.

197557081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88200, while the sum is 43.

The square root of 197557081 is about 14055.5000266799. The cubic root of 197557081 is about 582.4127406484.

The spelling of 197557081 in words is "one hundred ninety-seven million, five hundred fifty-seven thousand, eighty-one".