8251520125 has 16 divisors (see below), whose sum is σ = 10300925232. Its totient is φ = 6599275200.

The previous prime is 8251520117. The next prime is 8251520153. The reversal of 8251520125 is 5210251528.

It can be written as a sum of positive squares in 8 ways, for example, as 1867190521 + 6384329604 = 43211^2 + 79902^2 .

It is not a de Polignac number, because 8251520125 - 2³ = 8251520117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 542119 + ... + 557131.

It is an arithmetic number, because the mean of its divisors is an integer number (643807827).

Almost surely, 2^8251520125 is an apocalyptic number.

It is an amenable number.

8251520125 is a deficient number, since it is larger than the sum of its proper divisors (2049405107).

8251520125 is a wasteful number, since it uses less digits than its factorization.

8251520125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19425 (or 19415 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 31.

The square root of 8251520125 is about 90837.8782502101. The cubic root of 8251520125 is about 2020.7441075377.

The spelling of 8251520125 in words is "eight billion, two hundred fifty-one million, five hundred twenty thousand, one hundred twenty-five".