671398225 has 6 divisors (see below), whose sum is σ = 832533830. Its totient is φ = 537118560.

The previous prime is 671398213. The next prime is 671398237. The reversal of 671398225 is 522893176.

It is an interprime number because it is at equal distance from previous prime (671398213) and next prime (671398237).

It can be written as a sum of positive squares in 3 ways, for example, as 170668096 + 500730129 = 13064^2 + 22377^2 .

It is a de Polignac number, because none of the positive numbers 2^k-671398225 is a prime.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 13427940 + ... + 13427989.

Almost surely, 2^671398225 is an apocalyptic number.

It is an amenable number.

671398225 is a deficient number, since it is larger than the sum of its proper divisors (161135605).

671398225 is a wasteful number, since it uses less digits than its factorization.

671398225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26855939 (or 26855934 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 671398225 is about 25911.3532066544. The cubic root of 671398225 is about 875.6422930358.

The spelling of 671398225 in words is "six hundred seventy-one million, three hundred ninety-eight thousand, two hundred twenty-five".