161131230 has 96 divisors (see below), whose sum is σ = 462309120. Its totient is φ = 38684160.

The previous prime is 161131213. The next prime is 161131231. The reversal of 161131230 is 32131161.

161131230 is a `hidden beast` number, since 1 + 611 + 31 + 23 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161131231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46291 + ... + 49649.

It is an arithmetic number, because the mean of its divisors is an integer number (4815720).

Almost surely, 2^161131230 is an apocalyptic number.

161131230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161131230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231154560).

161131230 is an abundant number, since it is smaller than the sum of its proper divisors (301177890).

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

161131230 is a wasteful number, since it uses less digits than its factorization.

161131230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426 (or 3423 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 161131230 is about 12693.7476735596. The cubic root of 161131230 is about 544.1599492719.

Adding to 161131230 its reverse (32131161), we get a palindrome (193262391).

The spelling of 161131230 in words is "one hundred sixty-one million, one hundred thirty-one thousand, two hundred thirty".