671741569 has 2 divisors, whose sum is σ = 671741570. Its totient is φ = 671741568.

The previous prime is 671741537. The next prime is 671741597. The reversal of 671741569 is 965147176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599270400 + 72471169 = 24480^2 + 8513^2 .

It is a cyclic number.

It is not a de Polignac number, because 671741569 - 2⁵ = 671741537 is a prime.

It is a super-4 number, since 4×671741569⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (671741509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335870784 + 335870785.

It is an arithmetic number, because the mean of its divisors is an integer number (335870785).

Almost surely, 2^671741569 is an apocalyptic number.

It is an amenable number.

671741569 is a deficient number, since it is larger than the sum of its proper divisors (1).

671741569 is an equidigital number, since it uses as much as digits as its factorization.

671741569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 46.

The square root of 671741569 is about 25917.9777181786. The cubic root of 671741569 is about 875.7915314867.

The spelling of 671741569 in words is "six hundred seventy-one million, seven hundred forty-one thousand, five hundred sixty-nine".