161489550 has 48 divisors (see below), whose sum is σ = 421580160. Its totient is φ = 40796640.

The previous prime is 161489539. The next prime is 161489551. The reversal of 161489550 is 55984161.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161489499 and 161489508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161489551) 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, 25482 + ... + 31181.

It is an arithmetic number, because the mean of its divisors is an integer number (8782920).

Almost surely, 2^161489550 is an apocalyptic number.

161489550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161489550 is an abundant number, since it is smaller than the sum of its proper divisors (260090610).

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

161489550 is a wasteful number, since it uses less digits than its factorization.

161489550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56697 (or 56692 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 161489550 is about 12707.8538707368. The cubic root of 161489550 is about 544.5630141901.

The spelling of 161489550 in words is "one hundred sixty-one million, four hundred eighty-nine thousand, five hundred fifty".