7207561 has 2 divisors, whose sum is σ = 7207562. Its totient is φ = 7207560.

The previous prime is 7207511. The next prime is 7207597. The reversal of 7207561 is 1657027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6760000 + 447561 = 2600^2 + 669^2 .

It is a cyclic number.

It is not a de Polignac number, because 7207561 - 2⁹ = 7207049 is a prime.

7207561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7207511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3603780 + 3603781.

It is an arithmetic number, because the mean of its divisors is an integer number (3603781).

Almost surely, 2^7207561 is an apocalyptic number.

It is an amenable number.

7207561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7207561 is an equidigital number, since it uses as much as digits as its factorization.

7207561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 7207561 is about 2684.6901124711. The cubic root of 7207561 is about 193.1654464708.

It can be divided in two parts, 720 and 7561, that added together give a square (8281 = 91²).

The spelling of 7207561 in words is "seven million, two hundred seven thousand, five hundred sixty-one".