161326013 has 2 divisors, whose sum is σ = 161326014. Its totient is φ = 161326012.

The previous prime is 161326003. The next prime is 161326019. The reversal of 161326013 is 310623161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108951844 + 52374169 = 10438^2 + 7237^2 .

It is a cyclic number.

It is not a de Polignac number, because 161326013 - 2⁸ = 161325757 is a prime.

It is a super-3 number, since 3×161326013³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161326013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161326019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80663006 + 80663007.

It is an arithmetic number, because the mean of its divisors is an integer number (80663007).

Almost surely, 2^161326013 is an apocalyptic number.

It is an amenable number.

161326013 is a deficient number, since it is larger than the sum of its proper divisors (1).

161326013 is an equidigital number, since it uses as much as digits as its factorization.

161326013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 161326013 is about 12701.4177555106. The cubic root of 161326013 is about 544.3791296800.

Adding to 161326013 its reverse (310623161), we get a palindrome (471949174).

The spelling of 161326013 in words is "one hundred sixty-one million, three hundred twenty-six thousand, thirteen".