671558897 has 2 divisors, whose sum is σ = 671558898. Its totient is φ = 671558896.

The previous prime is 671558879. The next prime is 671558911. The reversal of 671558897 is 798855176.

Together with previous prime (671558879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 595799281 + 75759616 = 24409^2 + 8704^2 .

It is a cyclic number.

It is not a de Polignac number, because 671558897 - 2¹² = 671554801 is a prime.

It is not a weakly prime, because it can be changed into another prime (671558197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335779448 + 335779449.

It is an arithmetic number, because the mean of its divisors is an integer number (335779449).

Almost surely, 2^671558897 is an apocalyptic number.

It is an amenable number.

671558897 is a deficient number, since it is larger than the sum of its proper divisors (1).

671558897 is an equidigital number, since it uses as much as digits as its factorization.

671558897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4233600, while the sum is 56.

The square root of 671558897 is about 25914.4534381877. The cubic root of 671558897 is about 875.7121373159.

The spelling of 671558897 in words is "six hundred seventy-one million, five hundred fifty-eight thousand, eight hundred ninety-seven".