131581511 has 2 divisors, whose sum is σ = 131581512. Its totient is φ = 131581510.

The previous prime is 131581507. The next prime is 131581523. The reversal of 131581511 is 115185131.

It is a weak prime.

It is an emirp because it is prime and its reverse (115185131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131581511 - 2² = 131581507 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131581561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65790755 + 65790756.

It is an arithmetic number, because the mean of its divisors is an integer number (65790756).

Almost surely, 2^131581511 is an apocalyptic number.

131581511 is a deficient number, since it is larger than the sum of its proper divisors (1).

131581511 is an equidigital number, since it uses as much as digits as its factorization.

131581511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 26.

The square root of 131581511 is about 11470.8984390936. The cubic root of 131581511 is about 508.6256873391.

The spelling of 131581511 in words is "one hundred thirty-one million, five hundred eighty-one thousand, five hundred eleven".