11581567 has 2 divisors, whose sum is σ = 11581568. Its totient is φ = 11581566.

The previous prime is 11581529. The next prime is 11581589. The reversal of 11581567 is 76518511.

It is a strong prime.

It is an emirp because it is prime and its reverse (76518511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11581567 - 2¹⁹ = 11057279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11581517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5790783 + 5790784.

It is an arithmetic number, because the mean of its divisors is an integer number (5790784).

Almost surely, 2^11581567 is an apocalyptic number.

11581567 is a deficient number, since it is larger than the sum of its proper divisors (1).

11581567 is an equidigital number, since it uses as much as digits as its factorization.

11581567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 34.

The square root of 11581567 is about 3403.1701397374. The cubic root of 11581567 is about 226.2502709519.

The spelling of 11581567 in words is "eleven million, five hundred eighty-one thousand, five hundred sixty-seven".