190404161 has 2 divisors, whose sum is σ = 190404162. Its totient is φ = 190404160.

The previous prime is 190404157. The next prime is 190404167. The reversal of 190404161 is 161404091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138203536 + 52200625 = 11756^2 + 7225^2 .

It is an emirp because it is prime and its reverse (161404091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190404161 - 2² = 190404157 is a prime.

It is a super-2 number, since 2×190404161² = 72507489052227842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 190404161.

It is not a weakly prime, because it can be changed into another prime (190404167) 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, 95202080 + 95202081.

It is an arithmetic number, because the mean of its divisors is an integer number (95202081).

Almost surely, 2^190404161 is an apocalyptic number.

It is an amenable number.

190404161 is a deficient number, since it is larger than the sum of its proper divisors (1).

190404161 is an equidigital number, since it uses as much as digits as its factorization.

190404161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 190404161 is about 13798.7014244095. The cubic root of 190404161 is about 575.2970472739.

The spelling of 190404161 in words is "one hundred ninety million, four hundred four thousand, one hundred sixty-one".