169408813 has 4 divisors (see below), whose sum is σ = 193610080. Its totient is φ = 145207548.

The previous prime is 169408753. The next prime is 169408817. The reversal of 169408813 is 318804961.

169408813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169408813 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 (169408817) 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, 12100623 + ... + 12100636.

It is an arithmetic number, because the mean of its divisors is an integer number (48402520).

Almost surely, 2^169408813 is an apocalyptic number.

It is an amenable number.

169408813 is a deficient number, since it is larger than the sum of its proper divisors (24201267).

169408813 is an equidigital number, since it uses as much as digits as its factorization.

169408813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24201266.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 169408813 is about 13015.7140795271. The cubic root of 169408813 is about 553.3229281039.

The spelling of 169408813 in words is "one hundred sixty-nine million, four hundred eight thousand, eight hundred thirteen".