7125958309 has 2 divisors, whose sum is σ = 7125958310. Its totient is φ = 7125958308.

The previous prime is 7125958297. The next prime is 7125958321. The reversal of 7125958309 is 9038595217.

7125958309 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (7125958297) and next prime (7125958321).

It can be written as a sum of positive squares in only one way, i.e., 6927232900 + 198725409 = 83230^2 + 14097^2 .

It is a cyclic number.

It is not a de Polignac number, because 7125958309 - 2⁷ = 7125958181 is a prime.

It is a super-2 number, since 2×7125958309² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7125958339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3562979154 + 3562979155.

It is an arithmetic number, because the mean of its divisors is an integer number (3562979155).

Almost surely, 2^7125958309 is an apocalyptic number.

It is an amenable number.

7125958309 is a deficient number, since it is larger than the sum of its proper divisors (1).

7125958309 is an equidigital number, since it uses as much as digits as its factorization.

7125958309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 49.

The square root of 7125958309 is about 84415.3914224177. The cubic root of 7125958309 is about 1924.3368320229.

The spelling of 7125958309 in words is "seven billion, one hundred twenty-five million, nine hundred fifty-eight thousand, three hundred nine".