161313601 has 2 divisors, whose sum is σ = 161313602. Its totient is φ = 161313600.

The previous prime is 161313539. The next prime is 161313617. The reversal of 161313601 is 106313161.

It is a happy number.

161313601 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., 94090000 + 67223601 = 9700^2 + 8199^2 .

It is an emirp because it is prime and its reverse (106313161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161313601 - 2¹⁹ = 160789313 is a prime.

It is not a weakly prime, because it can be changed into another prime (161313641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80656800 + 80656801.

It is an arithmetic number, because the mean of its divisors is an integer number (80656801).

Almost surely, 2^161313601 is an apocalyptic number.

It is an amenable number.

161313601 is a deficient number, since it is larger than the sum of its proper divisors (1).

161313601 is an equidigital number, since it uses as much as digits as its factorization.

161313601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 161313601 is about 12700.9291392402. The cubic root of 161313601 is about 544.3651682882.

Adding to 161313601 its reverse (106313161), we get a palindrome (267626762).

The spelling of 161313601 in words is "one hundred sixty-one million, three hundred thirteen thousand, six hundred one".