161899850 has 24 divisors (see below), whose sum is σ = 344153568. Its totient is φ = 55508400.

The previous prime is 161899849. The next prime is 161899861. The reversal of 161899850 is 58998161.

It is a super-2 number, since 2×161899850² = 52423122860045000, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161899795 and 161899804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230936 + ... + 231635.

It is an arithmetic number, because the mean of its divisors is an integer number (14339732).

Almost surely, 2^161899850 is an apocalyptic number.

161899850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161899850 is an abundant number, since it is smaller than the sum of its proper divisors (182253718).

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

161899850 is a wasteful number, since it uses less digits than its factorization.

161899850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462590 (or 462585 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 161899850 is about 12723.9871895566. The cubic root of 161899850 is about 545.0238185028.

The spelling of 161899850 in words is "one hundred sixty-one million, eight hundred ninety-nine thousand, eight hundred fifty".