31530220811 has 2 divisors, whose sum is σ = 31530220812. Its totient is φ = 31530220810.

The previous prime is 31530220783. The next prime is 31530220849. The reversal of 31530220811 is 11802203513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31530220811 - 2⁶ = 31530220747 is a prime.

It is not a weakly prime, because it can be changed into another prime (31530220411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15765110405 + 15765110406.

It is an arithmetic number, because the mean of its divisors is an integer number (15765110406).

Almost surely, 2^31530220811 is an apocalyptic number.

31530220811 is a deficient number, since it is larger than the sum of its proper divisors (1).

31530220811 is an equidigital number, since it uses as much as digits as its factorization.

31530220811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 31530220811 in words is "thirty-one billion, five hundred thirty million, two hundred twenty thousand, eight hundred eleven".