161923208 has 32 divisors (see below), whose sum is σ = 311731200. Its totient is φ = 78808128.

The previous prime is 161923193. The next prime is 161923247. The reversal of 161923208 is 802329161.

It is a super-2 number, since 2×161923208² = 52438250578022528, which contains 22 as substring.

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, 131138 + ... + 132366.

It is an arithmetic number, because the mean of its divisors is an integer number (9741600).

Almost surely, 2^161923208 is an apocalyptic number.

It is an amenable number.

161923208 is a deficient number, since it is larger than the sum of its proper divisors (149807992).

161923208 is a wasteful number, since it uses less digits than its factorization.

161923208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 161923208 is about 12724.9050291151. The cubic root of 161923208 is about 545.0500282330.

The spelling of 161923208 in words is "one hundred sixty-one million, nine hundred twenty-three thousand, two hundred eight".