161771136 has 32 divisors (see below), whose sum is σ = 429705600. Its totient is φ = 53923584.

The previous prime is 161771131. The next prime is 161771171. The reversal of 161771136 is 631177161.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 161771097 and 161771106.

It is not an unprimeable number, because it can be changed into a prime (161771131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210256 + ... + 211023.

It is an arithmetic number, because the mean of its divisors is an integer number (13428300).

Almost surely, 2^161771136 is an apocalyptic number.

161771136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161771136 is an abundant number, since it is smaller than the sum of its proper divisors (267934464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161771136 is an equidigital number, since it uses as much as digits as its factorization.

161771136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421296 (or 421284 counting only the distinct ones).

The product of its digits is 5292, while the sum is 33.

The square root of 161771136 is about 12718.9282567361. The cubic root of 161771136 is about 544.8793448363.

The spelling of 161771136 in words is "one hundred sixty-one million, seven hundred seventy-one thousand, one hundred thirty-six".