161993528 has 16 divisors (see below), whose sum is σ = 307152000. Its totient is φ = 80086336.

The previous prime is 161993509. The next prime is 161993539. The reversal of 161993528 is 825399161.

It is a happy number.

It is a super-2 number, since 2×161993528² = 52483806227773568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113048 + ... + 114471.

It is an arithmetic number, because the mean of its divisors is an integer number (19197000).

Almost surely, 2^161993528 is an apocalyptic number.

It is an amenable number.

161993528 is a deficient number, since it is larger than the sum of its proper divisors (145158472).

161993528 is a wasteful number, since it uses less digits than its factorization.

161993528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227614 (or 227610 counting only the distinct ones).

The product of its digits is 116640, while the sum is 44.

The square root of 161993528 is about 12727.6678146470. The cubic root of 161993528 is about 545.1289182440.

The spelling of 161993528 in words is "one hundred sixty-one million, nine hundred ninety-three thousand, five hundred twenty-eight".