671641249 has 2 divisors, whose sum is σ = 671641250. Its totient is φ = 671641248.

The previous prime is 671641237. The next prime is 671641273. The reversal of 671641249 is 942146176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349690000 + 321951249 = 18700^2 + 17943^2 .

It is a cyclic number.

It is not a de Polignac number, because 671641249 - 2⁷ = 671641121 is a prime.

It is a super-2 number, since 2×671641249² = 902203934716560002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (671641349) 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, 335820624 + 335820625.

It is an arithmetic number, because the mean of its divisors is an integer number (335820625).

Almost surely, 2^671641249 is an apocalyptic number.

It is an amenable number.

671641249 is a deficient number, since it is larger than the sum of its proper divisors (1).

671641249 is an equidigital number, since it uses as much as digits as its factorization.

671641249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 671641249 is about 25916.0423097355. The cubic root of 671641249 is about 875.7479314950.

The spelling of 671641249 in words is "six hundred seventy-one million, six hundred forty-one thousand, two hundred forty-nine".