161359993 has 2 divisors, whose sum is σ = 161359994. Its totient is φ = 161359992.

The previous prime is 161359963. The next prime is 161360011. The reversal of 161359993 is 399953161.

161359993 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., 148913209 + 12446784 = 12203^2 + 3528^2 .

It is a cyclic number.

It is not a de Polignac number, because 161359993 - 2⁹ = 161359481 is a prime.

It is a super-3 number, since 3×161359993³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (161359943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80679996 + 80679997.

It is an arithmetic number, because the mean of its divisors is an integer number (80679997).

Almost surely, 2^161359993 is an apocalyptic number.

It is an amenable number.

161359993 is a deficient number, since it is larger than the sum of its proper divisors (1).

161359993 is an equidigital number, since it uses as much as digits as its factorization.

161359993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196830, while the sum is 46.

The square root of 161359993 is about 12702.7553310296. The cubic root of 161359993 is about 544.4173477452.

The spelling of 161359993 in words is "one hundred sixty-one million, three hundred fifty-nine thousand, nine hundred ninety-three".