11388978241 has 4 divisors (see below), whose sum is σ = 11884151232. Its totient is φ = 10893805252.

The previous prime is 11388978239. The next prime is 11388978277. The reversal of 11388978241 is 14287988311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11388978241 - 2¹ = 11388978239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11388978941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247586461 + ... + 247586506.

It is an arithmetic number, because the mean of its divisors is an integer number (2971037808).

Almost surely, 2^11388978241 is an apocalyptic number.

It is an amenable number.

11388978241 is a deficient number, since it is larger than the sum of its proper divisors (495172991).

11388978241 is an equidigital number, since it uses as much as digits as its factorization.

11388978241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495172990.

The product of its digits is 774144, while the sum is 52.

The spelling of 11388978241 in words is "eleven billion, three hundred eighty-eight million, nine hundred seventy-eight thousand, two hundred forty-one".