11978528539 has 2 divisors, whose sum is σ = 11978528540. Its totient is φ = 11978528538.

The previous prime is 11978528537. The next prime is 11978528579. The reversal of 11978528539 is 93582587911.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11978528539 - 2¹ = 11978528537 is a prime.

Together with 11978528537, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11978528531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5989264269 + 5989264270.

It is an arithmetic number, because the mean of its divisors is an integer number (5989264270).

Almost surely, 2^11978528539 is an apocalyptic number.

11978528539 is a deficient number, since it is larger than the sum of its proper divisors (1).

11978528539 is an equidigital number, since it uses as much as digits as its factorization.

11978528539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 58.

The spelling of 11978528539 in words is "eleven billion, nine hundred seventy-eight million, five hundred twenty-eight thousand, five hundred thirty-nine".