181607 has 2 divisors, whose sum is σ = 181608. Its totient is φ = 181606.

The previous prime is 181603. The next prime is 181609. The reversal of 181607 is 706181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 181607 - 2² = 181603 is a prime.

It is a super-2 number, since 2×181607² = 65962204898, which contains 22 as substring.

Together with 181609, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90803 + 90804.

It is an arithmetic number, because the mean of its divisors is an integer number (90804).

2¹⁸¹⁶⁰⁷ is an apocalyptic number.

181607 is a deficient number, since it is larger than the sum of its proper divisors (1).

181607 is an equidigital number, since it uses as much as digits as its factorization.

181607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 181607 is about 426.1537281311. The cubic root of 181607 is about 56.6296913727.

Adding to 181607 its reverse (706181), we get a palindrome (887788).

The spelling of 181607 in words is "one hundred eighty-one thousand, six hundred seven".