131205307 has 2 divisors, whose sum is σ = 131205308. Its totient is φ = 131205306.

The previous prime is 131205301. The next prime is 131205323. The reversal of 131205307 is 703502131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131205307 is a prime.

It is not a weakly prime, because it can be changed into another prime (131205301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65602653 + 65602654.

It is an arithmetic number, because the mean of its divisors is an integer number (65602654).

Almost surely, 2^131205307 is an apocalyptic number.

131205307 is a deficient number, since it is larger than the sum of its proper divisors (1).

131205307 is an equidigital number, since it uses as much as digits as its factorization.

131205307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 131205307 is about 11454.4885088772. The cubic root of 131205307 is about 508.1404883002.

Adding to 131205307 its reverse (703502131), we get a palindrome (834707438).

The spelling of 131205307 in words is "one hundred thirty-one million, two hundred five thousand, three hundred seven".