3125312521 has 4 divisors (see below), whose sum is σ = 3309154452. Its totient is φ = 2941470592.

The previous prime is 3125312507. The next prime is 3125312539. The reversal of 3125312521 is 1252135213.

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 2756250000 + 369062521 = 52500^2 + 19211^2 .

It is a cyclic number.

It is not a de Polignac number, because 3125312521 - 2¹¹ = 3125310473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3125312501) 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, 91920940 + ... + 91920973.

It is an arithmetic number, because the mean of its divisors is an integer number (827288613).

Almost surely, 2^3125312521 is an apocalyptic number.

It is an amenable number.

3125312521 is a deficient number, since it is larger than the sum of its proper divisors (183841931).

3125312521 is a wasteful number, since it uses less digits than its factorization.

3125312521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183841930.

The product of its digits is 1800, while the sum is 25.

The square root of 3125312521 is about 55904.4946404133. The cubic root of 3125312521 is about 1462.0576043857.

Adding to 3125312521 its reverse (1252135213), we get a palindrome (4377447734).

The spelling of 3125312521 in words is "three billion, one hundred twenty-five million, three hundred twelve thousand, five hundred twenty-one".