11821567 has 2 divisors, whose sum is σ = 11821568. Its totient is φ = 11821566.

The previous prime is 11821561. The next prime is 11821573. The reversal of 11821567 is 76512811.

It is a balanced prime because it is at equal distance from previous prime (11821561) and next prime (11821573).

It is a cyclic number.

It is not a de Polignac number, because 11821567 - 2³ = 11821559 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 (11821561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5910783 + 5910784.

It is an arithmetic number, because the mean of its divisors is an integer number (5910784).

Almost surely, 2^11821567 is an apocalyptic number.

11821567 is a deficient number, since it is larger than the sum of its proper divisors (1).

11821567 is an equidigital number, since it uses as much as digits as its factorization.

11821567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 31.

The square root of 11821567 is about 3438.2505726023. The cubic root of 11821567 is about 227.8024283631.

The spelling of 11821567 in words is "eleven million, eight hundred twenty-one thousand, five hundred sixty-seven".