131209277 has 2 divisors, whose sum is σ = 131209278. Its totient is φ = 131209276.

The previous prime is 131209261. The next prime is 131209367. The reversal of 131209277 is 772902131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126990361 + 4218916 = 11269^2 + 2054^2 .

It is a cyclic number.

It is not a de Polignac number, because 131209277 - 2⁴ = 131209261 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 (131209217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65604638 + 65604639.

It is an arithmetic number, because the mean of its divisors is an integer number (65604639).

Almost surely, 2^131209277 is an apocalyptic number.

It is an amenable number.

131209277 is a deficient number, since it is larger than the sum of its proper divisors (1).

131209277 is an equidigital number, since it uses as much as digits as its factorization.

131209277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 131209277 is about 11454.6618020787. The cubic root of 131209277 is about 508.1456133403.

The spelling of 131209277 in words is "one hundred thirty-one million, two hundred nine thousand, two hundred seventy-seven".