169985749 has 4 divisors (see below), whose sum is σ = 170057664. Its totient is φ = 169913836.

The previous prime is 169985707. The next prime is 169985773. The reversal of 169985749 is 947589961.

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, and also an emirpimes, since its reverse is a distinct semiprime: 947589961 = 3079 ⋅307759.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169985749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 169985693 and 169985702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169985779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32287 + ... + 37180.

It is an arithmetic number, because the mean of its divisors is an integer number (42514416).

Almost surely, 2^169985749 is an apocalyptic number.

It is an amenable number.

169985749 is a deficient number, since it is larger than the sum of its proper divisors (71915).

169985749 is an equidigital number, since it uses as much as digits as its factorization.

169985749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71914.

The product of its digits is 4898880, while the sum is 58.

The square root of 169985749 is about 13037.8582980488. The cubic root of 169985749 is about 553.9503456998.

The spelling of 169985749 in words is "one hundred sixty-nine million, nine hundred eighty-five thousand, seven hundred forty-nine".