312523143521 has 4 divisors (see below), whose sum is σ = 314771511600. Its totient is φ = 310274775444.

The previous prime is 312523143497. The next prime is 312523143563. The reversal of 312523143521 is 125341325213.

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 a cyclic number.

It is not a de Polignac number, because 312523143521 - 2¹⁰ = 312523142497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312523143421) 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, 1124183831 + ... + 1124184108.

It is an arithmetic number, because the mean of its divisors is an integer number (78692877900).

Almost surely, 2^312523143521 is an apocalyptic number.

It is an amenable number.

312523143521 is a deficient number, since it is larger than the sum of its proper divisors (2248368079).

312523143521 is a wasteful number, since it uses less digits than its factorization.

312523143521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248368078.

The product of its digits is 21600, while the sum is 32.

Adding to 312523143521 its reverse (125341325213), we get a palindrome (437864468734).

The spelling of 312523143521 in words is "three hundred twelve billion, five hundred twenty-three million, one hundred forty-three thousand, five hundred twenty-one".