315531601243 has 4 divisors (see below), whose sum is σ = 315545711760. Its totient is φ = 315517490728.

The previous prime is 315531601211. The next prime is 315531601289. The reversal of 315531601243 is 342106135513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342106135513 = 223 ⋅1534108231.

It is a cyclic number.

It is not a de Polignac number, because 315531601243 - 2⁵ = 315531601211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315531601199 and 315531601208.

It is not an unprimeable number, because it can be changed into a prime (315531608243) 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, 7021663 + ... + 7066456.

It is an arithmetic number, because the mean of its divisors is an integer number (78886427940).

Almost surely, 2^315531601243 is an apocalyptic number.

315531601243 is a deficient number, since it is larger than the sum of its proper divisors (14110517).

315531601243 is a wasteful number, since it uses less digits than its factorization.

315531601243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14110516.

The product of its (nonzero) digits is 32400, while the sum is 34.

Adding to 315531601243 its reverse (342106135513), we get a palindrome (657637736756).

The spelling of 315531601243 in words is "three hundred fifteen billion, five hundred thirty-one million, six hundred one thousand, two hundred forty-three".