131213112809 has 2 divisors, whose sum is σ = 131213112810. Its totient is φ = 131213112808.

The previous prime is 131213112803. The next prime is 131213112869. The reversal of 131213112809 is 908211312131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118574856409 + 12638256400 = 344347^2 + 112420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131213112809 is a prime.

It is not a weakly prime, because it can be changed into another prime (131213112803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65606556404 + 65606556405.

It is an arithmetic number, because the mean of its divisors is an integer number (65606556405).

Almost surely, 2^131213112809 is an apocalyptic number.

It is an amenable number.

131213112809 is a deficient number, since it is larger than the sum of its proper divisors (1).

131213112809 is an equidigital number, since it uses as much as digits as its factorization.

131213112809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 131213112809 in words is "one hundred thirty-one billion, two hundred thirteen million, one hundred twelve thousand, eight hundred nine".