161233613 has 2 divisors, whose sum is σ = 161233614. Its totient is φ = 161233612.

The previous prime is 161233609. The next prime is 161233651. The reversal of 161233613 is 316332161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133217764 + 28015849 = 11542^2 + 5293^2 .

It is a cyclic number.

It is not a de Polignac number, because 161233613 - 2² = 161233609 is a prime.

It is a super-2 number, since 2×161233613² = 51992555922067538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161233603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80616806 + 80616807.

It is an arithmetic number, because the mean of its divisors is an integer number (80616807).

Almost surely, 2^161233613 is an apocalyptic number.

It is an amenable number.

161233613 is a deficient number, since it is larger than the sum of its proper divisors (1).

161233613 is an equidigital number, since it uses as much as digits as its factorization.

161233613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 26.

The square root of 161233613 is about 12697.7798453115. The cubic root of 161233613 is about 544.2751781907.

Adding to 161233613 its reverse (316332161), we get a palindrome (477565774).

The spelling of 161233613 in words is "one hundred sixty-one million, two hundred thirty-three thousand, six hundred thirteen".