671818249 has 4 divisors (see below), whose sum is σ = 672728080. Its totient is φ = 670908420.

The previous prime is 671818241. The next prime is 671818253. The reversal of 671818249 is 942818176.

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 671818249 - 2³ = 671818241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 671818199 and 671818208.

It is not an unprimeable number, because it can be changed into a prime (671818241) 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, 453807 + ... + 455284.

It is an arithmetic number, because the mean of its divisors is an integer number (168182020).

Almost surely, 2^671818249 is an apocalyptic number.

It is an amenable number.

671818249 is a deficient number, since it is larger than the sum of its proper divisors (909831).

671818249 is an equidigital number, since it uses as much as digits as its factorization.

671818249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909830.

The product of its digits is 193536, while the sum is 46.

The square root of 671818249 is about 25919.4569580460. The cubic root of 671818249 is about 875.8248543908.

The spelling of 671818249 in words is "six hundred seventy-one million, eight hundred eighteen thousand, two hundred forty-nine".