131186477 has 2 divisors, whose sum is σ = 131186478. Its totient is φ = 131186476.

The previous prime is 131186453. The next prime is 131186479. The reversal of 131186477 is 774681131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131010916 + 175561 = 11446^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 131186477 - 2⁸ = 131186221 is a prime.

Together with 131186479, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131186477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131186479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65593238 + 65593239.

It is an arithmetic number, because the mean of its divisors is an integer number (65593239).

Almost surely, 2^131186477 is an apocalyptic number.

It is an amenable number.

131186477 is a deficient number, since it is larger than the sum of its proper divisors (1).

131186477 is an equidigital number, since it uses as much as digits as its factorization.

131186477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 131186477 is about 11453.6665308538. Note that the first 3 decimals coincide. The cubic root of 131186477 is about 508.1161784523.

The spelling of 131186477 in words is "one hundred thirty-one million, one hundred eighty-six thousand, four hundred seventy-seven".