161243837 has 2 divisors, whose sum is σ = 161243838. Its totient is φ = 161243836.

The previous prime is 161243833. The next prime is 161243843. The reversal of 161243837 is 738342161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147598201 + 13645636 = 12149^2 + 3694^2 .

It is a cyclic number.

It is not a de Polignac number, because 161243837 - 2² = 161243833 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161243797 and 161243806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161243833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80621918 + 80621919.

It is an arithmetic number, because the mean of its divisors is an integer number (80621919).

Almost surely, 2^161243837 is an apocalyptic number.

It is an amenable number.

161243837 is a deficient number, since it is larger than the sum of its proper divisors (1).

161243837 is an equidigital number, since it uses as much as digits as its factorization.

161243837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 161243837 is about 12698.1824289935. The cubic root of 161243837 is about 544.2866823093.

Adding to 161243837 its reverse (738342161), we get a palindrome (899585998).

The spelling of 161243837 in words is "one hundred sixty-one million, two hundred forty-three thousand, eight hundred thirty-seven".