161823850 has 48 divisors (see below), whose sum is σ = 324026136. Its totient is φ = 59904000.

The previous prime is 161823847. The next prime is 161823853. The reversal of 161823850 is 58328161.

161823850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161823847) and next prime (161823853).

It can be written as a sum of positive squares in 12 ways, for example, as 12666481 + 149157369 = 3559^2 + 12213^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (161823853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50290 + ... + 53410.

Almost surely, 2^161823850 is an apocalyptic number.

161823850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161823850 is an abundant number, since it is smaller than the sum of its proper divisors (162202286).

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

161823850 is a wasteful number, since it uses less digits than its factorization.

161823850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211 (or 3206 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 161823850 is about 12721.0003537458. Note that the first 3 decimals coincide. The cubic root of 161823850 is about 544.9385223699.

The spelling of 161823850 in words is "one hundred sixty-one million, eight hundred twenty-three thousand, eight hundred fifty".