31578452047 has 2 divisors, whose sum is σ = 31578452048. Its totient is φ = 31578452046.

The previous prime is 31578452023. The next prime is 31578452093. The reversal of 31578452047 is 74025487513.

It is an a-pointer prime, because the next prime (31578452093) can be obtained adding 31578452047 to its sum of digits (46).

It is a weak prime.

It is an emirp because it is prime and its reverse (74025487513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31578452047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31578451988 and 31578452006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31578459047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15789226023 + 15789226024.

It is an arithmetic number, because the mean of its divisors is an integer number (15789226024).

Almost surely, 2^31578452047 is an apocalyptic number.

31578452047 is a deficient number, since it is larger than the sum of its proper divisors (1).

31578452047 is an equidigital number, since it uses as much as digits as its factorization.

31578452047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 940800, while the sum is 46.

The spelling of 31578452047 in words is "thirty-one billion, five hundred seventy-eight million, four hundred fifty-two thousand, forty-seven".