7779641 has 2 divisors, whose sum is σ = 7779642. Its totient is φ = 7779640.

The previous prime is 7779631. The next prime is 7779677. The reversal of 7779641 is 1469777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7268416 + 511225 = 2696^2 + 715^2 .

It is an emirp because it is prime and its reverse (1469777) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7779641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7779601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889820 + 3889821.

It is an arithmetic number, because the mean of its divisors is an integer number (3889821).

Almost surely, 2^7779641 is an apocalyptic number.

It is an amenable number.

7779641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7779641 is an equidigital number, since it uses as much as digits as its factorization.

7779641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 41.

The square root of 7779641 is about 2789.2007815860. The cubic root of 7779641 is about 198.1465517062.

The spelling of 7779641 in words is "seven million, seven hundred seventy-nine thousand, six hundred forty-one".