161356213 has 2 divisors, whose sum is σ = 161356214. Its totient is φ = 161356212.

The previous prime is 161356193. The next prime is 161356219. The reversal of 161356213 is 312653161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120626289 + 40729924 = 10983^2 + 6382^2 .

It is an emirp because it is prime and its reverse (312653161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161356213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161356219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80678106 + 80678107.

It is an arithmetic number, because the mean of its divisors is an integer number (80678107).

Almost surely, 2^161356213 is an apocalyptic number.

It is an amenable number.

161356213 is a deficient number, since it is larger than the sum of its proper divisors (1).

161356213 is an equidigital number, since it uses as much as digits as its factorization.

161356213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 28.

The square root of 161356213 is about 12702.6065435406. The cubic root of 161356213 is about 544.4130965600.

The spelling of 161356213 in words is "one hundred sixty-one million, three hundred fifty-six thousand, two hundred thirteen".