31220320244143 has 2 divisors, whose sum is σ = 31220320244144. Its totient is φ = 31220320244142.

The previous prime is 31220320244089. The next prime is 31220320244171. The reversal of 31220320244143 is 34144202302213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31220320244143 - 2²⁹ = 31219783373231 is a prime.

It is a super-2 number, since 2×31220320244143² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31220320244543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610160122071 + 15610160122072.

It is an arithmetic number, because the mean of its divisors is an integer number (15610160122072).

Almost surely, 2^{31220320244143} is an apocalyptic number.

31220320244143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220320244143 is an equidigital number, since it uses as much as digits as its factorization.

31220320244143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 31220320244143 its reverse (34144202302213), we get a palindrome (65364522546356).

The spelling of 31220320244143 in words is "thirty-one trillion, two hundred twenty billion, three hundred twenty million, two hundred forty-four thousand, one hundred forty-three".