161571116 has 24 divisors (see below), whose sum is σ = 327237120. Its totient is φ = 68367312.

The previous prime is 161571097. The next prime is 161571133. The reversal of 161571116 is 611175161.

It is a super-2 number, since 2×161571116² = 52210451050970912, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 34310 + ... + 38733.

It is an arithmetic number, because the mean of its divisors is an integer number (13634880).

Almost surely, 2^161571116 is an apocalyptic number.

It is an amenable number.

161571116 is an abundant number, since it is smaller than the sum of its proper divisors (165666004).

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

161571116 is a wasteful number, since it uses less digits than its factorization.

161571116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73133 (or 73131 counting only the distinct ones).

The product of its digits is 1260, while the sum is 29.

The square root of 161571116 is about 12711.0627407782. The cubic root of 161571116 is about 544.6546823520.

The spelling of 161571116 in words is "one hundred sixty-one million, five hundred seventy-one thousand, one hundred sixteen".