7726561 has 2 divisors, whose sum is σ = 7726562. Its totient is φ = 7726560.

The previous prime is 7726549. The next prime is 7726567. The reversal of 7726561 is 1656277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3900625 + 3825936 = 1975^2 + 1956^2 .

It is a cyclic number.

It is not a de Polignac number, because 7726561 - 2¹¹ = 7724513 is a prime.

It is an Ulam number.

7726561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7726567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3863280 + 3863281.

It is an arithmetic number, because the mean of its divisors is an integer number (3863281).

Almost surely, 2^7726561 is an apocalyptic number.

It is an amenable number.

7726561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7726561 is an equidigital number, since it uses as much as digits as its factorization.

7726561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 34.

The square root of 7726561 is about 2779.6692249259. The cubic root of 7726561 is about 197.6948757485.

The spelling of 7726561 in words is "seven million, seven hundred twenty-six thousand, five hundred sixty-one".