169769813 has 4 divisors (see below), whose sum is σ = 169822380. Its totient is φ = 169717248.

The previous prime is 169769797. The next prime is 169769819. The reversal of 169769813 is 318967961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318967961 = 13 ⋅24535997.

It can be written as a sum of positive squares in 2 ways, for example, as 11437924 + 158331889 = 3382^2 + 12583^2 .

It is a cyclic number.

It is not a de Polignac number, because 169769813 - 2⁴ = 169769797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169769819) 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, 21098 + ... + 28011.

It is an arithmetic number, because the mean of its divisors is an integer number (42455595).

Almost surely, 2^169769813 is an apocalyptic number.

It is an amenable number.

169769813 is a deficient number, since it is larger than the sum of its proper divisors (52567).

169769813 is an equidigital number, since it uses as much as digits as its factorization.

169769813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52566.

The product of its digits is 489888, while the sum is 50.

The square root of 169769813 is about 13029.5745517649. The cubic root of 169769813 is about 553.7156818937.

The spelling of 169769813 in words is "one hundred sixty-nine million, seven hundred sixty-nine thousand, eight hundred thirteen".