31713205478351 has 2 divisors, whose sum is σ = 31713205478352. Its totient is φ = 31713205478350.

The previous prime is 31713205478327. The next prime is 31713205478441. The reversal of 31713205478351 is 15387450231713.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31713205478351 - 2⁶ = 31713205478287 is a prime.

It is a super-2 number, since 2×31713205478351² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31713205478351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31713205478321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15856602739175 + 15856602739176.

It is an arithmetic number, because the mean of its divisors is an integer number (15856602739176).

Almost surely, 2^{31713205478351} is an apocalyptic number.

31713205478351 is a deficient number, since it is larger than the sum of its proper divisors (1).

31713205478351 is an equidigital number, since it uses as much as digits as its factorization.

31713205478351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116800, while the sum is 50.

The spelling of 31713205478351 in words is "thirty-one trillion, seven hundred thirteen billion, two hundred five million, four hundred seventy-eight thousand, three hundred fifty-one".