161111213 has 2 divisors, whose sum is σ = 161111214. Its totient is φ = 161111212.

The previous prime is 161111191. The next prime is 161111231. The reversal of 161111213 is 312111161.

Together with next prime (161111231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110103049 + 51008164 = 10493^2 + 7142^2 .

It is a cyclic number.

It is not a de Polignac number, because 161111213 - 2²⁴ = 144333997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161111191 and 161111200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161111273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80555606 + 80555607.

It is an arithmetic number, because the mean of its divisors is an integer number (80555607).

Almost surely, 2^161111213 is an apocalyptic number.

It is an amenable number.

161111213 is a deficient number, since it is larger than the sum of its proper divisors (1).

161111213 is an equidigital number, since it uses as much as digits as its factorization.

161111213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 17.

The square root of 161111213 is about 12692.9591900392. The cubic root of 161111213 is about 544.1374150498.

Adding to 161111213 its reverse (312111161), we get a palindrome (473222374).

The spelling of 161111213 in words is "one hundred sixty-one million, one hundred eleven thousand, two hundred thirteen".