845217229 has 4 divisors (see below), whose sum is σ = 847027584. Its totient is φ = 843406876.

The previous prime is 845217181. The next prime is 845217239. The reversal of 845217229 is 922712548.

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 845217229 - 2¹⁷ = 845086157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 845217191 and 845217200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845217239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904477 + ... + 905410.

It is an arithmetic number, because the mean of its divisors is an integer number (211756896).

Almost surely, 2^845217229 is an apocalyptic number.

It is an amenable number.

845217229 is a deficient number, since it is larger than the sum of its proper divisors (1810355).

845217229 is a wasteful number, since it uses less digits than its factorization.

845217229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810354.

The product of its digits is 80640, while the sum is 40.

The square root of 845217229 is about 29072.6199197802. The cubic root of 845217229 is about 945.4882014083.

The spelling of 845217229 in words is "eight hundred forty-five million, two hundred seventeen thousand, two hundred twenty-nine".