631387353540847 has 4 divisors (see below), whose sum is σ = 635036991422760. Its totient is φ = 627737715658936.

The previous prime is 631387353540809. The next prime is 631387353540863. The reversal of 631387353540847 is 748045353783136.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631387353540847 is a prime.

It is a super-2 number, since 2×631387353540847² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631387353540347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1824818940697 + ... + 1824818941042.

It is an arithmetic number, because the mean of its divisors is an integer number (158759247855690).

Almost surely, 2^{631387353540847} is an apocalyptic number.

631387353540847 is a deficient number, since it is larger than the sum of its proper divisors (3649637881913).

631387353540847 is a wasteful number, since it uses less digits than its factorization.

631387353540847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3649637881912.

The product of its (nonzero) digits is 609638400, while the sum is 67.

The spelling of 631387353540847 in words is "six hundred thirty-one trillion, three hundred eighty-seven billion, three hundred fifty-three million, five hundred forty thousand, eight hundred forty-seven".