31120221089 has 2 divisors, whose sum is σ = 31120221090. Its totient is φ = 31120221088.

The previous prime is 31120221073. The next prime is 31120221149. The reversal of 31120221089 is 98012202113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28911221089 + 2209000000 = 170033^2 + 47000^2 .

It is a cyclic number.

It is not a de Polignac number, because 31120221089 - 2⁴ = 31120221073 is a prime.

It is not a weakly prime, because it can be changed into another prime (31120221019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560110544 + 15560110545.

It is an arithmetic number, because the mean of its divisors is an integer number (15560110545).

Almost surely, 2^31120221089 is an apocalyptic number.

It is an amenable number.

31120221089 is a deficient number, since it is larger than the sum of its proper divisors (1).

31120221089 is an equidigital number, since it uses as much as digits as its factorization.

31120221089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 31120221089 in words is "thirty-one billion, one hundred twenty million, two hundred twenty-one thousand, eighty-nine".