31213111240447 has 2 divisors, whose sum is σ = 31213111240448. Its totient is φ = 31213111240446.

The previous prime is 31213111240331. The next prime is 31213111240453. The reversal of 31213111240447 is 74404211131213.

It is a strong prime.

It is an emirp because it is prime and its reverse (74404211131213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31213111240447 - 2⁷ = 31213111240319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31213111240477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606555620223 + 15606555620224.

It is an arithmetic number, because the mean of its divisors is an integer number (15606555620224).

Almost surely, 2^{31213111240447} is an apocalyptic number.

31213111240447 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213111240447 is an equidigital number, since it uses as much as digits as its factorization.

31213111240447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 31213111240447 in words is "thirty-one trillion, two hundred thirteen billion, one hundred eleven million, two hundred forty thousand, four hundred forty-seven".