131206511 has 2 divisors, whose sum is σ = 131206512. Its totient is φ = 131206510.

The previous prime is 131206507. The next prime is 131206541. The reversal of 131206511 is 115602131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131206511 - 2² = 131206507 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131206541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65603255 + 65603256.

It is an arithmetic number, because the mean of its divisors is an integer number (65603256).

Almost surely, 2^131206511 is an apocalyptic number.

131206511 is a deficient number, since it is larger than the sum of its proper divisors (1).

131206511 is an equidigital number, since it uses as much as digits as its factorization.

131206511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 131206511 is about 11454.5410645735. The cubic root of 131206511 is about 508.1420426054.

Adding to 131206511 its reverse (115602131), we get a palindrome (246808642).

The spelling of 131206511 in words is "one hundred thirty-one million, two hundred six thousand, five hundred eleven".