161020215 has 12 divisors (see below), whose sum is σ = 279101784. Its totient is φ = 85877424.

The previous prime is 161020213. The next prime is 161020259. The reversal of 161020215 is 512020161.

It is not a de Polignac number, because 161020215 - 2¹ = 161020213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161020213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1789069 + ... + 1789158.

It is an arithmetic number, because the mean of its divisors is an integer number (23258482).

Almost surely, 2^161020215 is an apocalyptic number.

161020215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161020215 is a deficient number, since it is larger than the sum of its proper divisors (118081569).

161020215 is a wasteful number, since it uses less digits than its factorization.

161020215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578238 (or 3578235 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 161020215 is about 12689.3740980397. The cubic root of 161020215 is about 544.0349501316.

Adding to 161020215 its reverse (512020161), we get a palindrome (673040376).

The spelling of 161020215 in words is "one hundred sixty-one million, twenty thousand, two hundred fifteen".