11111241997 has 4 divisors (see below), whose sum is σ = 11221254396. Its totient is φ = 11001229600.

The previous prime is 11111241989. The next prime is 11111242001. The reversal of 11111241997 is 79914211111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5433016681 + 5678225316 = 73709^2 + 75354^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111241997 - 2³ = 11111241989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111241397) 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, 55006048 + ... + 55006249.

It is an arithmetic number, because the mean of its divisors is an integer number (2805313599).

Almost surely, 2^11111241997 is an apocalyptic number.

It is an amenable number.

11111241997 is a deficient number, since it is larger than the sum of its proper divisors (110012399).

11111241997 is a wasteful number, since it uses less digits than its factorization.

11111241997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110012398.

The product of its digits is 4536, while the sum is 37.

The spelling of 11111241997 in words is "eleven billion, one hundred eleven million, two hundred forty-one thousand, nine hundred ninety-seven".