671069261 has 2 divisors, whose sum is σ = 671069262. Its totient is φ = 671069260.

The previous prime is 671069257. The next prime is 671069279. The reversal of 671069261 is 162960176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670499236 + 570025 = 25894^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 671069261 - 2² = 671069257 is a prime.

It is a super-2 number, since 2×671069261² = 900667906118172242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671069221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335534630 + 335534631.

It is an arithmetic number, because the mean of its divisors is an integer number (335534631).

Almost surely, 2^671069261 is an apocalyptic number.

It is an amenable number.

671069261 is a deficient number, since it is larger than the sum of its proper divisors (1).

671069261 is an equidigital number, since it uses as much as digits as its factorization.

671069261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 671069261 is about 25905.0045551048. The cubic root of 671069261 is about 875.4992572838.

It can be divided in two parts, 67106 and 9261, that added together give a palindrome (76367).

The spelling of 671069261 in words is "six hundred seventy-one million, sixty-nine thousand, two hundred sixty-one".