161548213 has 2 divisors, whose sum is σ = 161548214. Its totient is φ = 161548212.

The previous prime is 161548207. The next prime is 161548237. The reversal of 161548213 is 312845161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146361604 + 15186609 = 12098^2 + 3897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161548213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161548243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80774106 + 80774107.

It is an arithmetic number, because the mean of its divisors is an integer number (80774107).

Almost surely, 2^161548213 is an apocalyptic number.

It is an amenable number.

161548213 is a deficient number, since it is larger than the sum of its proper divisors (1).

161548213 is an equidigital number, since it uses as much as digits as its factorization.

161548213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 161548213 is about 12710.1618007010. The cubic root of 161548213 is about 544.6289458714.

The spelling of 161548213 in words is "one hundred sixty-one million, five hundred forty-eight thousand, two hundred thirteen".