8128501913 has 4 divisors (see below), whose sum is σ = 9289716480. Its totient is φ = 6967287348.

The previous prime is 8128501889. The next prime is 8128501919. The reversal of 8128501913 is 3191058218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8128501913 - 2⁸ = 8128501657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8128501919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580607273 + ... + 580607286.

It is an arithmetic number, because the mean of its divisors is an integer number (2322429120).

Almost surely, 2^8128501913 is an apocalyptic number.

It is an amenable number.

8128501913 is a deficient number, since it is larger than the sum of its proper divisors (1161214567).

8128501913 is a wasteful number, since it uses less digits than its factorization.

8128501913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161214566.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 8128501913 is about 90158.2049122541. The cubic root of 8128501913 is about 2010.6516630772.

The spelling of 8128501913 in words is "eight billion, one hundred twenty-eight million, five hundred one thousand, nine hundred thirteen".