161530005 has 64 divisors (see below), whose sum is σ = 336849408. Its totient is φ = 64143360.

The previous prime is 161530003. The next prime is 161530063. The reversal of 161530005 is 500035161.

It is a happy number.

It is not a de Polignac number, because 161530005 - 2¹ = 161530003 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161530003) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19725 + ... + 26685.

It is an arithmetic number, because the mean of its divisors is an integer number (5263272).

Almost surely, 2^161530005 is an apocalyptic number.

161530005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161530005 is an abundant number, since it is smaller than the sum of its proper divisors (175319403).

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

161530005 is a wasteful number, since it uses less digits than its factorization.

161530005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 161530005 is about 12709.4455032468. The cubic root of 161530005 is about 544.6084835045.

Adding to 161530005 its reverse (500035161), we get a palindrome (661565166).

The spelling of 161530005 in words is "one hundred sixty-one million, five hundred thirty thousand, five".