11520420487 has 2 divisors, whose sum is σ = 11520420488. Its totient is φ = 11520420486.

The previous prime is 11520420449. The next prime is 11520420511. The reversal of 11520420487 is 78402402511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11520420487 - 2¹⁵ = 11520387719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11520420407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760210243 + 5760210244.

It is an arithmetic number, because the mean of its divisors is an integer number (5760210244).

Almost surely, 2^11520420487 is an apocalyptic number.

11520420487 is a deficient number, since it is larger than the sum of its proper divisors (1).

11520420487 is an equidigital number, since it uses as much as digits as its factorization.

11520420487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 34.

Adding to 11520420487 its reverse (78402402511), we get a palindrome (89922822998).

The spelling of 11520420487 in words is "eleven billion, five hundred twenty million, four hundred twenty thousand, four hundred eighty-seven".