671523399 has 8 divisors (see below), whose sum is σ = 994849520. Its totient is φ = 447682248.

The previous prime is 671523361. The next prime is 671523407. The reversal of 671523399 is 993325176.

It is not a de Polignac number, because 671523399 - 2¹⁹ = 670999111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671523299) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 12435592 + ... + 12435645.

It is an arithmetic number, because the mean of its divisors is an integer number (124356190).

Almost surely, 2^671523399 is an apocalyptic number.

671523399 is a deficient number, since it is larger than the sum of its proper divisors (323326121).

671523399 is a wasteful number, since it uses less digits than its factorization.

671523399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24871246 (or 24871240 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 671523399 is about 25913.7685217724. The cubic root of 671523399 is about 875.6967072584.

The spelling of 671523399 in words is "six hundred seventy-one million, five hundred twenty-three thousand, three hundred ninety-nine".