161758393 has 2 divisors, whose sum is σ = 161758394. Its totient is φ = 161758392.

The previous prime is 161758369. The next prime is 161758439. The reversal of 161758393 is 393857161.

161758393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110607289 + 51151104 = 10517^2 + 7152^2 .

It is a cyclic number.

It is not a de Polignac number, because 161758393 - 2²¹ = 159661241 is a prime.

It is not a weakly prime, because it can be changed into another prime (161758313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80879196 + 80879197.

It is an arithmetic number, because the mean of its divisors is an integer number (80879197).

Almost surely, 2^161758393 is an apocalyptic number.

It is an amenable number.

161758393 is a deficient number, since it is larger than the sum of its proper divisors (1).

161758393 is an equidigital number, since it uses as much as digits as its factorization.

161758393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 161758393 is about 12718.4273005745. The cubic root of 161758393 is about 544.8650374223.

The spelling of 161758393 in words is "one hundred sixty-one million, seven hundred fifty-eight thousand, three hundred ninety-three".