31113220543 has 2 divisors, whose sum is σ = 31113220544. Its totient is φ = 31113220542.

The previous prime is 31113220493. The next prime is 31113220549. The reversal of 31113220543 is 34502231113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31113220543 - 2²¹ = 31111123391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31113220549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556610271 + 15556610272.

It is an arithmetic number, because the mean of its divisors is an integer number (15556610272).

Almost surely, 2^31113220543 is an apocalyptic number.

31113220543 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113220543 is an equidigital number, since it uses as much as digits as its factorization.

31113220543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 31113220543 its reverse (34502231113), we get a palindrome (65615451656).

The spelling of 31113220543 in words is "thirty-one billion, one hundred thirteen million, two hundred twenty thousand, five hundred forty-three".