161613311 has 2 divisors, whose sum is σ = 161613312. Its totient is φ = 161613310.

The previous prime is 161613301. The next prime is 161613343. The reversal of 161613311 is 113316161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161613311 - 2¹⁸ = 161351167 is a prime.

It is a super-2 number, since 2×161613311² = 52237724584765442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161613301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80806655 + 80806656.

It is an arithmetic number, because the mean of its divisors is an integer number (80806656).

Almost surely, 2^161613311 is an apocalyptic number.

161613311 is a deficient number, since it is larger than the sum of its proper divisors (1).

161613311 is an equidigital number, since it uses as much as digits as its factorization.

161613311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 23.

The square root of 161613311 is about 12712.7224071007. The cubic root of 161613311 is about 544.7020912053.

Adding to 161613311 its reverse (113316161), we get a palindrome (274929472).

The spelling of 161613311 in words is "one hundred sixty-one million, six hundred thirteen thousand, three hundred eleven".