671287069 has 2 divisors, whose sum is σ = 671287070. Its totient is φ = 671287068.

The previous prime is 671287033. The next prime is 671287087. The reversal of 671287069 is 960782176.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429111225 + 242175844 = 20715^2 + 15562^2 .

It is a cyclic number.

It is not a de Polignac number, because 671287069 - 2¹³ = 671278877 is a prime.

It is a super-2 number, since 2×671287069² = 901252658013221522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671287369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335643534 + 335643535.

It is an arithmetic number, because the mean of its divisors is an integer number (335643535).

Almost surely, 2^671287069 is an apocalyptic number.

It is an amenable number.

671287069 is a deficient number, since it is larger than the sum of its proper divisors (1).

671287069 is an equidigital number, since it uses as much as digits as its factorization.

671287069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 671287069 is about 25909.2081893677. The cubic root of 671287069 is about 875.5939668894.

The spelling of 671287069 in words is "six hundred seventy-one million, two hundred eighty-seven thousand, sixty-nine".