169899641 has 4 divisors (see below), whose sum is σ = 170576784. Its totient is φ = 169222500.

The previous prime is 169899617. The next prime is 169899647. The reversal of 169899641 is 146998961.

It is a happy number.

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 not a de Polignac number, because 169899641 - 2¹⁸ = 169637497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169899647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338195 + ... + 338696.

It is an arithmetic number, because the mean of its divisors is an integer number (42644196).

Almost surely, 2^169899641 is an apocalyptic number.

It is an amenable number.

169899641 is a deficient number, since it is larger than the sum of its proper divisors (677143).

169899641 is an equidigital number, since it uses as much as digits as its factorization.

169899641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677142.

The product of its digits is 839808, while the sum is 53.

The square root of 169899641 is about 13034.5556502706. Note that the first 3 decimals coincide. The cubic root of 169899641 is about 553.8567935184.

The spelling of 169899641 in words is "one hundred sixty-nine million, eight hundred ninety-nine thousand, six hundred forty-one".