101031231209 has 2 divisors, whose sum is σ = 101031231210. Its totient is φ = 101031231208.

The previous prime is 101031231187. The next prime is 101031231271. The reversal of 101031231209 is 902132130101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100882464400 + 148766809 = 317620^2 + 12197^2 .

It is a cyclic number.

It is not a de Polignac number, because 101031231209 - 2³² = 96736263913 is a prime.

It is not a weakly prime, because it can be changed into another prime (101031236209) 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, 50515615604 + 50515615605.

It is an arithmetic number, because the mean of its divisors is an integer number (50515615605).

Almost surely, 2^101031231209 is an apocalyptic number.

It is an amenable number.

101031231209 is a deficient number, since it is larger than the sum of its proper divisors (1).

101031231209 is an equidigital number, since it uses as much as digits as its factorization.

101031231209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 101031231209 in words is "one hundred one billion, thirty-one million, two hundred thirty-one thousand, two hundred nine".