170849969 has 4 divisors (see below), whose sum is σ = 171735396. Its totient is φ = 169964544.

The previous prime is 170849947. The next prime is 170849971. The reversal of 170849969 is 969948071.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15523600 + 155326369 = 3940^2 + 12463^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170849969 is a prime.

It is a super-2 number, since 2×170849969² = 58379423814601922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 170849969.

It is not an unprimeable number, because it can be changed into a prime (170849909) 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, 442424 + ... + 442809.

It is an arithmetic number, because the mean of its divisors is an integer number (42933849).

Almost surely, 2^170849969 is an apocalyptic number.

It is an amenable number.

170849969 is a deficient number, since it is larger than the sum of its proper divisors (885427).

170849969 is an equidigital number, since it uses as much as digits as its factorization.

170849969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885426.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 170849969 is about 13070.9589931267. The cubic root of 170849969 is about 554.8875339572.

The spelling of 170849969 in words is "one hundred seventy million, eight hundred forty-nine thousand, nine hundred sixty-nine".