161015213 has 2 divisors, whose sum is σ = 161015214. Its totient is φ = 161015212.

The previous prime is 161015207. The next prime is 161015227. The reversal of 161015213 is 312510161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125933284 + 35081929 = 11222^2 + 5923^2 .

It is an emirp because it is prime and its reverse (312510161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161015213 - 2⁸ = 161014957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161015243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80507606 + 80507607.

It is an arithmetic number, because the mean of its divisors is an integer number (80507607).

Almost surely, 2^161015213 is an apocalyptic number.

It is an amenable number.

161015213 is a deficient number, since it is larger than the sum of its proper divisors (1).

161015213 is an equidigital number, since it uses as much as digits as its factorization.

161015213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 161015213 is about 12689.1770024695. The cubic root of 161015213 is about 544.0293166961.

Adding to 161015213 its reverse (312510161), we get a palindrome (473525374).

The spelling of 161015213 in words is "one hundred sixty-one million, fifteen thousand, two hundred thirteen".