7109128025 has 12 divisors (see below), whose sum is σ = 8816545452. Its totient is φ = 5686511040.

The previous prime is 7109128009. The next prime is 7109128031. The reversal of 7109128025 is 5208219017.

It can be written as a sum of positive squares in 6 ways, for example, as 297597001 + 6811531024 = 17251^2 + 82532^2 .

It is not a de Polignac number, because 7109128025 - 2⁴ = 7109128009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220859 + ... + 250991.

It is an arithmetic number, because the mean of its divisors is an integer number (734712121).

Almost surely, 2^7109128025 is an apocalyptic number.

It is an amenable number.

7109128025 is a deficient number, since it is larger than the sum of its proper divisors (1707417427).

7109128025 is a wasteful number, since it uses less digits than its factorization.

7109128025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39580 (or 39575 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 7109128025 is about 84315.6451970807. The cubic root of 7109128025 is about 1922.8206538890.

The spelling of 7109128025 in words is "seven billion, one hundred nine million, one hundred twenty-eight thousand, twenty-five".