31275765047 has 2 divisors, whose sum is σ = 31275765048. Its totient is φ = 31275765046.

The previous prime is 31275765041. The next prime is 31275765049. The reversal of 31275765047 is 74056757213.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (74056757213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31275765047 - 2⁸ = 31275764791 is a prime.

Together with 31275765049, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31275764992 and 31275765010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31275765041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15637882523 + 15637882524.

It is an arithmetic number, because the mean of its divisors is an integer number (15637882524).

Almost surely, 2^31275765047 is an apocalyptic number.

31275765047 is a deficient number, since it is larger than the sum of its proper divisors (1).

31275765047 is an equidigital number, since it uses as much as digits as its factorization.

31275765047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234800, while the sum is 47.

The spelling of 31275765047 in words is "thirty-one billion, two hundred seventy-five million, seven hundred sixty-five thousand, forty-seven".