168238537 has 4 divisors (see below), whose sum is σ = 175553280. Its totient is φ = 160923796.

The previous prime is 168238517. The next prime is 168238571. The reversal of 168238537 is 735832861.

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: 735832861 = 1367 ⋅538283.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168238537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168238493 and 168238502.

It is not an unprimeable number, because it can be changed into a prime (168238517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3657337 + ... + 3657382.

It is an arithmetic number, because the mean of its divisors is an integer number (43888320).

Almost surely, 2^168238537 is an apocalyptic number.

It is an amenable number.

168238537 is a deficient number, since it is larger than the sum of its proper divisors (7314743).

168238537 is an equidigital number, since it uses as much as digits as its factorization.

168238537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7314742.

The product of its digits is 241920, while the sum is 43.

The square root of 168238537 is about 12970.6798973685. The cubic root of 168238537 is about 552.0458647478.

The spelling of 168238537 in words is "one hundred sixty-eight million, two hundred thirty-eight thousand, five hundred thirty-seven".