7125208561 has 2 divisors, whose sum is σ = 7125208562. Its totient is φ = 7125208560.

The previous prime is 7125208543. The next prime is 7125208567. The reversal of 7125208561 is 1658025217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7042398561 + 82810000 = 83919^2 + 9100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7125208561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7125208561.

It is not a weakly prime, because it can be changed into another prime (7125208567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3562604280 + 3562604281.

It is an arithmetic number, because the mean of its divisors is an integer number (3562604281).

Almost surely, 2^7125208561 is an apocalyptic number.

It is an amenable number.

7125208561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7125208561 is an equidigital number, since it uses as much as digits as its factorization.

7125208561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 7125208561 is about 84410.9504803731. The cubic root of 7125208561 is about 1924.2693408293.

The spelling of 7125208561 in words is "seven billion, one hundred twenty-five million, two hundred eight thousand, five hundred sixty-one".