7128543523 has 4 divisors (see below), whose sum is σ = 7151031360. Its totient is φ = 7106055688.

The previous prime is 7128543493. The next prime is 7128543559. The reversal of 7128543523 is 3253458217.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7128543523 - 2⁹ = 7128543011 is a prime.

It is a super-2 number, since 2×7128543523² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7128543593) 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, 11243443 + ... + 11244076.

It is an arithmetic number, because the mean of its divisors is an integer number (1787757840).

Almost surely, 2^7128543523 is an apocalyptic number.

7128543523 is a deficient number, since it is larger than the sum of its proper divisors (22487837).

7128543523 is a wasteful number, since it uses less digits than its factorization.

7128543523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22487836.

The product of its digits is 201600, while the sum is 40.

The square root of 7128543523 is about 84430.7024902671. The cubic root of 7128543523 is about 1924.5695128227.

The spelling of 7128543523 in words is "seven billion, one hundred twenty-eight million, five hundred forty-three thousand, five hundred twenty-three".