168320137 has 4 divisors (see below), whose sum is σ = 168524496. Its totient is φ = 168115780.

The previous prime is 168320081. The next prime is 168320143. The reversal of 168320137 is 731023861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 731023861 = 2711 ⋅269651.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168320137 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168320099 and 168320108.

It is not an unprimeable number, because it can be changed into a prime (168320837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100939 + ... + 102592.

It is an arithmetic number, because the mean of its divisors is an integer number (42131124).

Almost surely, 2^168320137 is an apocalyptic number.

It is an amenable number.

168320137 is a deficient number, since it is larger than the sum of its proper divisors (204359).

168320137 is an equidigital number, since it uses as much as digits as its factorization.

168320137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204358.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 168320137 is about 12973.8250720441. The cubic root of 168320137 is about 552.1351024504.

Adding to 168320137 its reverse (731023861), we get a palindrome (899343998).

The spelling of 168320137 in words is "one hundred sixty-eight million, three hundred twenty thousand, one hundred thirty-seven".