161501408 has 48 divisors (see below), whose sum is σ = 326637360. Its totient is φ = 78575616.

The previous prime is 161501401. The next prime is 161501429. The reversal of 161501408 is 804105161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161501401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212966 + ... + 213722.

It is an arithmetic number, because the mean of its divisors is an integer number (6804945).

Almost surely, 2^161501408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161501408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163318680).

161501408 is an abundant number, since it is smaller than the sum of its proper divisors (165135952).

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

161501408 is a wasteful number, since it uses less digits than its factorization.

161501408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939 (or 931 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 161501408 is about 12708.3204240372. The cubic root of 161501408 is about 544.5763427515.

Adding to 161501408 its reverse (804105161), we get a palindrome (965606569).

The spelling of 161501408 in words is "one hundred sixty-one million, five hundred one thousand, four hundred eight".