161315632 has 40 divisors (see below), whose sum is σ = 328215600. Its totient is φ = 76699392.

The previous prime is 161315593. The next prime is 161315633. The reversal of 161315632 is 236513161.

It is a self number, because there is not a number n which added to its sum of digits gives 161315632.

It is not an unprimeable number, because it can be changed into a prime (161315633) 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, 28494 + ... + 33682.

It is an arithmetic number, because the mean of its divisors is an integer number (8205390).

Almost surely, 2^161315632 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 161315632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164107800).

161315632 is an abundant number, since it is smaller than the sum of its proper divisors (166899968).

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

161315632 is a wasteful number, since it uses less digits than its factorization.

161315632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5293 (or 5287 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 161315632 is about 12701.0090937689. The cubic root of 161315632 is about 544.3674528672.

Adding to 161315632 its reverse (236513161), we get a palindrome (397828793).

The spelling of 161315632 in words is "one hundred sixty-one million, three hundred fifteen thousand, six hundred thirty-two".