11531567 has 2 divisors, whose sum is σ = 11531568. Its totient is φ = 11531566.

The previous prime is 11531563. The next prime is 11531617. The reversal of 11531567 is 76513511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11531567 - 2² = 11531563 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11531561) 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, 5765783 + 5765784.

It is an arithmetic number, because the mean of its divisors is an integer number (5765784).

Almost surely, 2^11531567 is an apocalyptic number.

11531567 is a deficient number, since it is larger than the sum of its proper divisors (1).

11531567 is an equidigital number, since it uses as much as digits as its factorization.

11531567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 29.

The square root of 11531567 is about 3395.8161022058. The cubic root of 11531567 is about 225.9242116721.

The spelling of 11531567 in words is "eleven million, five hundred thirty-one thousand, five hundred sixty-seven".