671621337 has 12 divisors (see below), whose sum is σ = 972618660. Its totient is φ = 446594208.

The previous prime is 671621317. The next prime is 671621359. The reversal of 671621337 is 733126176.

It can be written as a sum of positive squares in 2 ways, for example, as 414692496 + 256928841 = 20364^2 + 16029^2 .

It is not a de Polignac number, because 671621337 - 2⁸ = 671621081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671621317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92418 + ... + 99419.

It is an arithmetic number, because the mean of its divisors is an integer number (81051555).

Almost surely, 2^671621337 is an apocalyptic number.

It is an amenable number.

671621337 is a deficient number, since it is larger than the sum of its proper divisors (300997323).

671621337 is a wasteful number, since it uses less digits than its factorization.

671621337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192232 (or 192229 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 671621337 is about 25915.6581432924. The cubic root of 671621337 is about 875.7392770409.

The spelling of 671621337 in words is "six hundred seventy-one million, six hundred twenty-one thousand, three hundred thirty-seven".