161171906 has 16 divisors (see below), whose sum is σ = 276541440. Its totient is φ = 69012000.

The previous prime is 161171903. The next prime is 161171911. The reversal of 161171906 is 609171161.

161171906 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161171903) 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 in 7 ways as a sum of consecutive naturals, for example, 13406 + ... + 22406.

It is an arithmetic number, because the mean of its divisors is an integer number (17283840).

Almost surely, 2^161171906 is an apocalyptic number.

161171906 is a deficient number, since it is larger than the sum of its proper divisors (115369534).

161171906 is a wasteful number, since it uses less digits than its factorization.

161171906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10289.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 161171906 is about 12695.3497785607. The cubic root of 161171906 is about 544.2057347017.

The spelling of 161171906 in words is "one hundred sixty-one million, one hundred seventy-one thousand, nine hundred six".