169113621 has 4 divisors (see below), whose sum is σ = 225484832. Its totient is φ = 112742412.

The previous prime is 169113613. The next prime is 169113629. The reversal of 169113621 is 126311961.

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: 126311961 = 3 ⋅42103987.

It is an interprime number because it is at equal distance from previous prime (169113613) and next prime (169113629).

It is not a de Polignac number, because 169113621 - 2³ = 169113613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169113629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28185601 + ... + 28185606.

It is an arithmetic number, because the mean of its divisors is an integer number (56371208).

Almost surely, 2^169113621 is an apocalyptic number.

It is an amenable number.

169113621 is a deficient number, since it is larger than the sum of its proper divisors (56371211).

169113621 is an equidigital number, since it uses as much as digits as its factorization.

169113621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56371210.

The product of its digits is 1944, while the sum is 30.

The square root of 169113621 is about 13004.3693041993. The cubic root of 169113621 is about 553.0013559629.

The spelling of 169113621 in words is "one hundred sixty-nine million, one hundred thirteen thousand, six hundred twenty-one".