11215987 has 2 divisors, whose sum is σ = 11215988. Its totient is φ = 11215986.

The previous prime is 11215969. The next prime is 11215993. The reversal of 11215987 is 78951211.

It is a happy number.

11215987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11215987 is a prime.

It is not a weakly prime, because it can be changed into another prime (11215907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5607993 + 5607994.

It is an arithmetic number, because the mean of its divisors is an integer number (5607994).

Almost surely, 2^11215987 is an apocalyptic number.

11215987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11215987 is an equidigital number, since it uses as much as digits as its factorization.

11215987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 34.

The square root of 11215987 is about 3349.0277693683. The cubic root of 11215987 is about 223.8441930434.

The spelling of 11215987 in words is "eleven million, two hundred fifteen thousand, nine hundred eighty-seven".