7641649 has 2 divisors, whose sum is σ = 7641650. Its totient is φ = 7641648.

The previous prime is 7641637. The next prime is 7641671. The reversal of 7641649 is 9461467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7290000 + 351649 = 2700^2 + 593^2 .

It is an emirp because it is prime and its reverse (9461467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7641649 - 2¹¹ = 7639601 is a prime.

It is not a weakly prime, because it can be changed into another prime (7641679) 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, 3820824 + 3820825.

It is an arithmetic number, because the mean of its divisors is an integer number (3820825).

Almost surely, 2^7641649 is an apocalyptic number.

It is an amenable number.

7641649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7641649 is an equidigital number, since it uses as much as digits as its factorization.

7641649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 7641649 is about 2764.3532697541. The cubic root of 7641649 is about 196.9680090975.

The spelling of 7641649 in words is "seven million, six hundred forty-one thousand, six hundred forty-nine".