161501215 has 16 divisors (see below), whose sum is σ = 197807616. Its totient is φ = 126554400.

The previous prime is 161501213. The next prime is 161501233. The reversal of 161501215 is 512105161.

It is a happy number.

It is not a de Polignac number, because 161501215 - 2¹ = 161501213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161501213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56470 + ... + 59260.

It is an arithmetic number, because the mean of its divisors is an integer number (12362976).

Almost surely, 2^161501215 is an apocalyptic number.

161501215 is a deficient number, since it is larger than the sum of its proper divisors (36306401).

161501215 is a wasteful number, since it uses less digits than its factorization.

161501215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 161501215 is about 12708.3128305846. The cubic root of 161501215 is about 544.5761258220.

Adding to 161501215 its reverse (512105161), we get a palindrome (673606376).

The spelling of 161501215 in words is "one hundred sixty-one million, five hundred one thousand, two hundred fifteen".