161649332 has 24 divisors (see below), whose sum is σ = 305797632. Its totient is φ = 74325600.

The previous prime is 161649307. The next prime is 161649349. The reversal of 161649332 is 233946161.

It is a happy number.

It is a super-2 number, since 2×161649332² = 52261013072092448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161649292 and 161649301.

It is a congruent number.

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, 8357 + ... + 19827.

It is an arithmetic number, because the mean of its divisors is an integer number (12741568).

Almost surely, 2^161649332 is an apocalyptic number.

It is an amenable number.

161649332 is a deficient number, since it is larger than the sum of its proper divisors (144148300).

161649332 is a wasteful number, since it uses less digits than its factorization.

161649332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11759 (or 11757 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 161649332 is about 12714.1390585442. The cubic root of 161649332 is about 544.7425566356.

The spelling of 161649332 in words is "one hundred sixty-one million, six hundred forty-nine thousand, three hundred thirty-two".