1111978149 has 4 divisors (see below), whose sum is σ = 1482637536. Its totient is φ = 741318764.

The previous prime is 1111978139. The next prime is 1111978159. The reversal of 1111978149 is 9418791111.

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 an interprime number because it is at equal distance from previous prime (1111978139) and next prime (1111978159).

It is a cyclic number.

It is not a de Polignac number, because 1111978149 - 2²⁴ = 1095200933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1111978149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111978139) 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, 185329689 + ... + 185329694.

It is an arithmetic number, because the mean of its divisors is an integer number (370659384).

Almost surely, 2^1111978149 is an apocalyptic number.

It is an amenable number.

1111978149 is a deficient number, since it is larger than the sum of its proper divisors (370659387).

1111978149 is an equidigital number, since it uses as much as digits as its factorization.

1111978149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370659386.

The product of its digits is 18144, while the sum is 42.

The square root of 1111978149 is about 33346.3363654840. The cubic root of 1111978149 is about 1036.0135074366.

The spelling of 1111978149 in words is "one billion, one hundred eleven million, nine hundred seventy-eight thousand, one hundred forty-nine".