161729593 has 2 divisors, whose sum is σ = 161729594. Its totient is φ = 161729592.

The previous prime is 161729563. The next prime is 161729597. The reversal of 161729593 is 395927161.

161729593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157051024 + 4678569 = 12532^2 + 2163^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161729593 is a prime.

It is a super-2 number, since 2×161729593² = 52312922503891298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161729597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80864796 + 80864797.

It is an arithmetic number, because the mean of its divisors is an integer number (80864797).

Almost surely, 2^161729593 is an apocalyptic number.

It is an amenable number.

161729593 is a deficient number, since it is larger than the sum of its proper divisors (1).

161729593 is an equidigital number, since it uses as much as digits as its factorization.

161729593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 43.

The square root of 161729593 is about 12717.2950347155. The cubic root of 161729593 is about 544.8326989778.

The spelling of 161729593 in words is "one hundred sixty-one million, seven hundred twenty-nine thousand, five hundred ninety-three".