161301504 has 176 divisors, whose sum is σ = 530058368. Its totient is φ = 42467328.

The previous prime is 161301499. The next prime is 161301521. The reversal of 161301504 is 405103161.

161301504 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279264 + ... + 279840.

Almost surely, 2^161301504 is an apocalyptic number.

161301504 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161301504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265029184).

161301504 is an abundant number, since it is smaller than the sum of its proper divisors (368756864).

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

161301504 is a wasteful number, since it uses less digits than its factorization.

161301504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 161301504 is about 12700.4529053101. The cubic root of 161301504 is about 544.3515605287.

Adding to 161301504 its reverse (405103161), we get a palindrome (566404665).

The spelling of 161301504 in words is "one hundred sixty-one million, three hundred one thousand, five hundred four".