671130972509 has 2 divisors, whose sum is σ = 671130972510. Its totient is φ = 671130972508.

The previous prime is 671130972481. The next prime is 671130972557. The reversal of 671130972509 is 905279031176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441327705625 + 229803266884 = 664325^2 + 479378^2 .

It is a cyclic number.

It is not a de Polignac number, because 671130972509 - 2²⁸ = 670862537053 is a prime.

It is a super-2 number, since 2×671130972509² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671130972409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335565486254 + 335565486255.

It is an arithmetic number, because the mean of its divisors is an integer number (335565486255).

Almost surely, 2^671130972509 is an apocalyptic number.

It is an amenable number.

671130972509 is a deficient number, since it is larger than the sum of its proper divisors (1).

671130972509 is an equidigital number, since it uses as much as digits as its factorization.

671130972509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 714420, while the sum is 50.

The spelling of 671130972509 in words is "six hundred seventy-one billion, one hundred thirty million, nine hundred seventy-two thousand, five hundred nine".