168043969 has 4 divisors (see below), whose sum is σ = 168075396. Its totient is φ = 168012544.

The previous prime is 168043949. The next prime is 168043979. The reversal of 168043969 is 969340861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 969340861 = 15901 ⋅60961.

It can be written as a sum of positive squares in 2 ways, for example, as 18593344 + 149450625 = 4312^2 + 12225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168043969 is a prime.

It is a super-2 number, since 2×168043969² = 56477551034545922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168043949) 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, 5464 + ... + 19129.

It is an arithmetic number, because the mean of its divisors is an integer number (42018849).

Almost surely, 2^168043969 is an apocalyptic number.

It is an amenable number.

168043969 is a deficient number, since it is larger than the sum of its proper divisors (31427).

168043969 is an equidigital number, since it uses as much as digits as its factorization.

168043969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31426.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 168043969 is about 12963.1774268503. The cubic root of 168043969 is about 551.8329688301.

The spelling of 168043969 in words is "one hundred sixty-eight million, forty-three thousand, nine hundred sixty-nine".