671554369 has 2 divisors, whose sum is σ = 671554370. Its totient is φ = 671554368.

The previous prime is 671554327. The next prime is 671554393. The reversal of 671554369 is 963455176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520387344 + 151167025 = 22812^2 + 12295^2 .

It is a cyclic number.

It is not a de Polignac number, because 671554369 - 2⁷ = 671554241 is a prime.

It is a super-2 number, since 2×671554369² = 901970541045976322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671554319) 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, 335777184 + 335777185.

It is an arithmetic number, because the mean of its divisors is an integer number (335777185).

Almost surely, 2^671554369 is an apocalyptic number.

It is an amenable number.

671554369 is a deficient number, since it is larger than the sum of its proper divisors (1).

671554369 is an equidigital number, since it uses as much as digits as its factorization.

671554369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 46.

The square root of 671554369 is about 25914.3660736666. The cubic root of 671554369 is about 875.7101691423.

The spelling of 671554369 in words is "six hundred seventy-one million, five hundred fifty-four thousand, three hundred sixty-nine".