161027329 has 2 divisors, whose sum is σ = 161027330. Its totient is φ = 161027328.

The previous prime is 161027327. The next prime is 161027341. The reversal of 161027329 is 923720161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87890625 + 73136704 = 9375^2 + 8552^2 .

It is a cyclic number.

It is not a de Polignac number, because 161027329 - 2¹ = 161027327 is a prime.

Together with 161027327, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 161027329.

It is not a weakly prime, because it can be changed into another prime (161027323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80513664 + 80513665.

It is an arithmetic number, because the mean of its divisors is an integer number (80513665).

Almost surely, 2^161027329 is an apocalyptic number.

It is an amenable number.

161027329 is a deficient number, since it is larger than the sum of its proper divisors (1).

161027329 is an equidigital number, since it uses as much as digits as its factorization.

161027329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 161027329 is about 12689.6544082177. The cubic root of 161027329 is about 544.0429619779.

The spelling of 161027329 in words is "one hundred sixty-one million, twenty-seven thousand, three hundred twenty-nine".