643226169 has 4 divisors (see below), whose sum is σ = 857634896. Its totient is φ = 428817444.

The previous prime is 643226153. The next prime is 643226189. The reversal of 643226169 is 961622346.

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 not a de Polignac number, because 643226169 - 2⁴ = 643226153 is a prime.

It is a super-2 number, since 2×643226169² = 827479808972833122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643226189) 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, 107204359 + ... + 107204364.

It is an arithmetic number, because the mean of its divisors is an integer number (214408724).

Almost surely, 2^643226169 is an apocalyptic number.

It is an amenable number.

643226169 is a deficient number, since it is larger than the sum of its proper divisors (214408727).

643226169 is a wasteful number, since it uses less digits than its factorization.

643226169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214408726.

The product of its digits is 93312, while the sum is 39.

The square root of 643226169 is about 25361.9038914668. The cubic root of 643226169 is about 863.2194851771.

The spelling of 643226169 in words is "six hundred forty-three million, two hundred twenty-six thousand, one hundred sixty-nine".