169790681 has 2 divisors, whose sum is σ = 169790682. Its totient is φ = 169790680.

The previous prime is 169790657. The next prime is 169790683. The reversal of 169790681 is 186097961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161696656 + 8094025 = 12716^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 169790681 - 2¹⁸ = 169528537 is a prime.

It is a super-2 number, since 2×169790681² = 57657750708887522, which contains 22 as substring.

Together with 169790683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (169790683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84895340 + 84895341.

It is an arithmetic number, because the mean of its divisors is an integer number (84895341).

Almost surely, 2^169790681 is an apocalyptic number.

It is an amenable number.

169790681 is a deficient number, since it is larger than the sum of its proper divisors (1).

169790681 is an equidigital number, since it uses as much as digits as its factorization.

169790681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 169790681 is about 13030.3753207649. The cubic root of 169790681 is about 553.7383684268.

The spelling of 169790681 in words is "one hundred sixty-nine million, seven hundred ninety thousand, six hundred eighty-one".