161622215 has 8 divisors (see below), whose sum is σ = 194046720. Its totient is φ = 129231072.

The previous prime is 161622211. The next prime is 161622221. The reversal of 161622215 is 512226161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161622215 - 2² = 161622211 is a prime.

It is a super-2 number, since 2×161622215² = 52243480763012450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161622211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3977 + ... + 18413.

It is an arithmetic number, because the mean of its divisors is an integer number (24255840).

Almost surely, 2^161622215 is an apocalyptic number.

161622215 is a deficient number, since it is larger than the sum of its proper divisors (32424505).

161622215 is a wasteful number, since it uses less digits than its factorization.

161622215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16681.

The product of its digits is 1440, while the sum is 26.

The square root of 161622215 is about 12713.0726026402. The cubic root of 161622215 is about 544.7120943796.

Adding to 161622215 its reverse (512226161), we get a palindrome (673848376).

The spelling of 161622215 in words is "one hundred sixty-one million, six hundred twenty-two thousand, two hundred fifteen".