168140969 has 2 divisors, whose sum is σ = 168140970. Its totient is φ = 168140968.

The previous prime is 168140957. The next prime is 168141007. The reversal of 168140969 is 969041861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160985344 + 7155625 = 12688^2 + 2675^2 .

It is an emirp because it is prime and its reverse (969041861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168140969 - 2⁴ = 168140953 is a prime.

It is a super-2 number, since 2×168140969² = 56542770912517922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168140909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84070484 + 84070485.

It is an arithmetic number, because the mean of its divisors is an integer number (84070485).

Almost surely, 2^168140969 is an apocalyptic number.

It is an amenable number.

168140969 is a deficient number, since it is larger than the sum of its proper divisors (1).

168140969 is an equidigital number, since it uses as much as digits as its factorization.

168140969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 168140969 is about 12966.9182537718. The cubic root of 168140969 is about 551.9391265663.

The spelling of 168140969 in words is "one hundred sixty-eight million, one hundred forty thousand, nine hundred sixty-nine".