197154161 has 2 divisors, whose sum is σ = 197154162. Its totient is φ = 197154160.

The previous prime is 197154131. The next prime is 197154169. The reversal of 197154161 is 161451791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184416400 + 12737761 = 13580^2 + 3569^2 .

It is an emirp because it is prime and its reverse (161451791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197154161 is a prime.

It is a super-2 number, since 2×197154161² = 77739526399227842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197154169) 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, 98577080 + 98577081.

It is an arithmetic number, because the mean of its divisors is an integer number (98577081).

Almost surely, 2^197154161 is an apocalyptic number.

It is an amenable number.

197154161 is a deficient number, since it is larger than the sum of its proper divisors (1).

197154161 is an equidigital number, since it uses as much as digits as its factorization.

197154161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 35.

The square root of 197154161 is about 14041.1595318905. The cubic root of 197154161 is about 582.0165252764.

The spelling of 197154161 in words is "one hundred ninety-seven million, one hundred fifty-four thousand, one hundred sixty-one".