7637681 has 2 divisors, whose sum is σ = 7637682. Its totient is φ = 7637680.

The previous prime is 7637659. The next prime is 7637711. The reversal of 7637681 is 1867367.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7612081 + 25600 = 2759^2 + 160^2 .

It is an emirp because it is prime and its reverse (1867367) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7637681 is a prime.

It is a super-2 number, since 2×7637681² = 116668342115522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7637611) 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, 3818840 + 3818841.

It is an arithmetic number, because the mean of its divisors is an integer number (3818841).

Almost surely, 2^7637681 is an apocalyptic number.

It is an amenable number.

7637681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7637681 is an equidigital number, since it uses as much as digits as its factorization.

7637681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 7637681 is about 2763.6354680022. The cubic root of 7637681 is about 196.9339106815.

The spelling of 7637681 in words is "seven million, six hundred thirty-seven thousand, six hundred eighty-one".