161828521 has 2 divisors, whose sum is σ = 161828522. Its totient is φ = 161828520.

The previous prime is 161828509. The next prime is 161828533. The reversal of 161828521 is 125828161.

161828521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (161828509) and next prime (161828533).

It can be written as a sum of positive squares in only one way, i.e., 141253225 + 20575296 = 11885^2 + 4536^2 .

It is an emirp because it is prime and its reverse (125828161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161828521 - 2⁵ = 161828489 is a prime.

It is not a weakly prime, because it can be changed into another prime (161828551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80914260 + 80914261.

It is an arithmetic number, because the mean of its divisors is an integer number (80914261).

Almost surely, 2^161828521 is an apocalyptic number.

It is an amenable number.

161828521 is a deficient number, since it is larger than the sum of its proper divisors (1).

161828521 is an equidigital number, since it uses as much as digits as its factorization.

161828521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 34.

The square root of 161828521 is about 12721.1839464729. The cubic root of 161828521 is about 544.9437654853.

The spelling of 161828521 in words is "one hundred sixty-one million, eight hundred twenty-eight thousand, five hundred twenty-one".