161622211 has 2 divisors, whose sum is σ = 161622212. Its totient is φ = 161622210.

The previous prime is 161622137. The next prime is 161622221. The reversal of 161622211 is 112226161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161622211 - 2¹¹ = 161620163 is a prime.

It is a super-2 number, since 2×161622211² = 52243478177057042, which contains 22 as substring.

It is equal to p_9060313 and since 161622211 and 9060313 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (161622221) 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 as a sum of consecutive naturals, namely, 80811105 + 80811106.

It is an arithmetic number, because the mean of its divisors is an integer number (80811106).

Almost surely, 2^161622211 is an apocalyptic number.

161622211 is a deficient number, since it is larger than the sum of its proper divisors (1).

161622211 is an equidigital number, since it uses as much as digits as its factorization.

161622211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 161622211 is about 12713.0724453218. The cubic root of 161622211 is about 544.7120898859.

Adding to 161622211 its reverse (112226161), we get a palindrome (273848372).

The spelling of 161622211 in words is "one hundred sixty-one million, six hundred twenty-two thousand, two hundred eleven".