168536989 has 8 divisors (see below), whose sum is σ = 170912448. Its totient is φ = 166178400.

The previous prime is 168536969. The next prime is 168536993. The reversal of 168536989 is 989635861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168536989 - 2⁹ = 168536477 is a prime.

It is a super-2 number, since 2×168536989² = 56809433322372242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168536969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16614 + ... + 24760.

It is an arithmetic number, because the mean of its divisors is an integer number (21364056).

Almost surely, 2^168536989 is an apocalyptic number.

It is an amenable number.

168536989 is a deficient number, since it is larger than the sum of its proper divisors (2375459).

168536989 is a wasteful number, since it uses less digits than its factorization.

168536989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8435.

The product of its digits is 2799360, while the sum is 55.

The square root of 168536989 is about 12982.1796706100. The cubic root of 168536989 is about 552.3721115652.

The spelling of 168536989 in words is "one hundred sixty-eight million, five hundred thirty-six thousand, nine hundred eighty-nine".