3125522331521 has 4 divisors (see below), whose sum is σ = 3125639872212. Its totient is φ = 3125404790832.

The previous prime is 3125522331487. The next prime is 3125522331523. The reversal of 3125522331521 is 1251332255213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2279194090000 + 846328241521 = 1509700^2 + 919961^2 .

It is a cyclic number.

It is not a de Polignac number, because 3125522331521 - 2²⁶ = 3125455222657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3125522331523) 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, 58730450 + ... + 58783643.

It is an arithmetic number, because the mean of its divisors is an integer number (781409968053).

Almost surely, 2^{3125522331521} is an apocalyptic number.

It is an amenable number.

3125522331521 is a deficient number, since it is larger than the sum of its proper divisors (117540691).

3125522331521 is a wasteful number, since it uses less digits than its factorization.

3125522331521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117540690.

The product of its digits is 54000, while the sum is 35.

Adding to 3125522331521 its reverse (1251332255213), we get a palindrome (4376854586734).

The spelling of 3125522331521 in words is "three trillion, one hundred twenty-five billion, five hundred twenty-two million, three hundred thirty-one thousand, five hundred twenty-one".