7801649 has 2 divisors, whose sum is σ = 7801650. Its totient is φ = 7801648.

The previous prime is 7801637. The next prime is 7801663. The reversal of 7801649 is 9461087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6927424 + 874225 = 2632^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 7801649 - 2¹² = 7797553 is a prime.

It is not a weakly prime, because it can be changed into another prime (7801679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3900824 + 3900825.

It is an arithmetic number, because the mean of its divisors is an integer number (3900825).

Almost surely, 2^7801649 is an apocalyptic number.

It is an amenable number.

7801649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7801649 is an equidigital number, since it uses as much as digits as its factorization.

7801649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 7801649 is about 2793.1432115092. The cubic root of 7801649 is about 198.3332228577. Note that the first 3 decimals are identical.

The spelling of 7801649 in words is "seven million, eight hundred one thousand, six hundred forty-nine".