161171011 has 2 divisors, whose sum is σ = 161171012. Its totient is φ = 161171010.

The previous prime is 161170991. The next prime is 161171071. The reversal of 161171011 is 110171161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161171011 - 2¹⁹ = 160646723 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161171011.

It is not a weakly prime, because it can be changed into another prime (161171071) 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, 80585505 + 80585506.

It is an arithmetic number, because the mean of its divisors is an integer number (80585506).

Almost surely, 2^161171011 is an apocalyptic number.

161171011 is a deficient number, since it is larger than the sum of its proper divisors (1).

161171011 is an equidigital number, since it uses as much as digits as its factorization.

161171011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 19.

The square root of 161171011 is about 12695.3145293845. The cubic root of 161171011 is about 544.2047273610.

The spelling of 161171011 in words is "one hundred sixty-one million, one hundred seventy-one thousand, eleven".