170399813 has 4 divisors (see below), whose sum is σ = 174555948. Its totient is φ = 166243680.

The previous prime is 170399767. The next prime is 170399833. The reversal of 170399813 is 318993071.

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 97160449 + 73239364 = 9857^2 + 8558^2 .

It is a cyclic number.

It is not a de Polignac number, because 170399813 - 2⁸ = 170399557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 4156093 = 170399813 / (1 + 7 + 0 + 3 + 9 + 9 + 8 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170399833) 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, 2078006 + ... + 2078087.

It is an arithmetic number, because the mean of its divisors is an integer number (43638987).

Almost surely, 2^170399813 is an apocalyptic number.

It is an amenable number.

170399813 is a deficient number, since it is larger than the sum of its proper divisors (4156135).

170399813 is an equidigital number, since it uses as much as digits as its factorization.

170399813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4156134.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 170399813 is about 13053.7279349617. The cubic root of 170399813 is about 554.3997655469.

The spelling of 170399813 in words is "one hundred seventy million, three hundred ninety-nine thousand, eight hundred thirteen".