161571332 has 24 divisors (see below), whose sum is σ = 322413336. Its totient is φ = 70184448.

The previous prime is 161571317. The next prime is 161571373. The reversal of 161571332 is 233175161.

It can be written as a sum of positive squares in 4 ways, for example, as 50353216 + 111218116 = 7096^2 + 10546^2 .

It is a super-2 number, since 2×161571332² = 52210590648508448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161571295 and 161571304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90503 + ... + 92270.

It is an arithmetic number, because the mean of its divisors is an integer number (13433889).

Almost surely, 2^161571332 is an apocalyptic number.

It is an amenable number.

161571332 is a deficient number, since it is larger than the sum of its proper divisors (160842004).

161571332 is a wasteful number, since it uses less digits than its factorization.

161571332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182807 (or 182805 counting only the distinct ones).

The product of its digits is 3780, while the sum is 29.

The square root of 161571332 is about 12711.0712373112. The cubic root of 161571332 is about 544.6549250632.

The spelling of 161571332 in words is "one hundred sixty-one million, five hundred seventy-one thousand, three hundred thirty-two".