161161172 has 6 divisors (see below), whose sum is σ = 282032058. Its totient is φ = 80580584.

The previous prime is 161161171. The next prime is 161161193. The reversal of 161161172 is 271161161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 160934596 + 226576 = 12686^2 + 476^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161161171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20145143 + ... + 20145150.

It is an arithmetic number, because the mean of its divisors is an integer number (47005343).

Almost surely, 2^161161172 is an apocalyptic number.

It is an amenable number.

161161172 is a deficient number, since it is larger than the sum of its proper divisors (120870886).

161161172 is a wasteful number, since it uses less digits than its factorization.

161161172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40290297 (or 40290295 counting only the distinct ones).

The product of its digits is 504, while the sum is 26.

The square root of 161161172 is about 12694.9270183014. The cubic root of 161161172 is about 544.1936531212.

The spelling of 161161172 in words is "one hundred sixty-one million, one hundred sixty-one thousand, one hundred seventy-two".