631330623265513 has 4 divisors (see below), whose sum is σ = 631333168985988. Its totient is φ = 631328077545040.

The previous prime is 631330623265493. The next prime is 631330623265603. The reversal of 631330623265513 is 315562326033136.

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 513823353899584 + 117507269365929 = 22667672^2 + 10840077^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631330623265513 is a prime.

It is a super-2 number, since 2×631330623265513² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631330623265313) 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, 1272488206 + ... + 1272984247.

It is an arithmetic number, because the mean of its divisors is an integer number (157833292246497).

Almost surely, 2^{631330623265513} is an apocalyptic number.

It is an amenable number.

631330623265513 is a deficient number, since it is larger than the sum of its proper divisors (2545720475).

631330623265513 is a wasteful number, since it uses less digits than its factorization.

631330623265513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545720474.

The product of its (nonzero) digits is 5248800, while the sum is 49.

Adding to 631330623265513 its reverse (315562326033136), we get a palindrome (946892949298649).

The spelling of 631330623265513 in words is "six hundred thirty-one trillion, three hundred thirty billion, six hundred twenty-three million, two hundred sixty-five thousand, five hundred thirteen".