168989761 has 4 divisors (see below), whose sum is σ = 170026672. Its totient is φ = 167952852.

The previous prime is 168989719. The next prime is 168989789. The reversal of 168989761 is 167989861.

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.

It is a cyclic number.

It is not a de Polignac number, because 168989761 - 2¹¹ = 168987713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168989791) 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, 518211 + ... + 518536.

It is an arithmetic number, because the mean of its divisors is an integer number (42506668).

Almost surely, 2^168989761 is an apocalyptic number.

It is an amenable number.

168989761 is a deficient number, since it is larger than the sum of its proper divisors (1036911).

168989761 is a wasteful number, since it uses less digits than its factorization.

168989761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036910.

The product of its digits is 1306368, while the sum is 55.

The square root of 168989761 is about 12999.6061863427. The cubic root of 168989761 is about 552.8663156344.

The spelling of 168989761 in words is "one hundred sixty-eight million, nine hundred eighty-nine thousand, seven hundred sixty-one".