161724337 has 2 divisors, whose sum is σ = 161724338. Its totient is φ = 161724336.

The previous prime is 161724323. The next prime is 161724341. The reversal of 161724337 is 733427161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156150016 + 5574321 = 12496^2 + 2361^2 .

It is an emirp because it is prime and its reverse (733427161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161724337 - 2⁷ = 161724209 is a prime.

It is a super-2 number, since 2×161724337² = 52309522356179138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161724307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80862168 + 80862169.

It is an arithmetic number, because the mean of its divisors is an integer number (80862169).

Almost surely, 2^161724337 is an apocalyptic number.

It is an amenable number.

161724337 is a deficient number, since it is larger than the sum of its proper divisors (1).

161724337 is an equidigital number, since it uses as much as digits as its factorization.

161724337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 34.

The square root of 161724337 is about 12717.0883853184. The cubic root of 161724337 is about 544.8267967974.

The spelling of 161724337 in words is "one hundred sixty-one million, seven hundred twenty-four thousand, three hundred thirty-seven".