671641247 has 16 divisors (see below), whose sum is σ = 704816640. Its totient is φ = 639200352.

The previous prime is 671641237. The next prime is 671641249. The reversal of 671641247 is 742146176.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 671641247 - 2⁴ = 671641231 is a prime.

It is a super-2 number, since 2×671641247² = 902203929343430018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671641247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671641249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 815678 + ... + 816500.

It is an arithmetic number, because the mean of its divisors is an integer number (44051040).

Almost surely, 2^671641247 is an apocalyptic number.

671641247 is a deficient number, since it is larger than the sum of its proper divisors (33175393).

671641247 is a wasteful number, since it uses less digits than its factorization.

671641247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222.

The product of its digits is 56448, while the sum is 38.

The square root of 671641247 is about 25916.0422711494. The cubic root of 671641247 is about 875.7479306258.

The spelling of 671641247 in words is "six hundred seventy-one million, six hundred forty-one thousand, two hundred forty-seven".