161372213 has 2 divisors, whose sum is σ = 161372214. Its totient is φ = 161372212.

The previous prime is 161372203. The next prime is 161372231. The reversal of 161372213 is 312273161.

161372213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (161372231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161213809 + 158404 = 12697^2 + 398^2 .

It is an emirp because it is prime and its reverse (312273161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161372213 - 2¹⁴ = 161355829 is a prime.

It is a super-2 number, since 2×161372213² = 52081982257034738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161372203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80686106 + 80686107.

It is an arithmetic number, because the mean of its divisors is an integer number (80686107).

Almost surely, 2^161372213 is an apocalyptic number.

It is an amenable number.

161372213 is a deficient number, since it is larger than the sum of its proper divisors (1).

161372213 is an equidigital number, since it uses as much as digits as its factorization.

161372213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

The square root of 161372213 is about 12703.2363199304. The cubic root of 161372213 is about 544.4310905405.

The spelling of 161372213 in words is "one hundred sixty-one million, three hundred seventy-two thousand, two hundred thirteen".