27919991149 has 4 divisors (see below), whose sum is σ = 27920532636. Its totient is φ = 27919449664.

The previous prime is 27919991131. The next prime is 27919991207. The reversal of 27919991149 is 94119991972.

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 10806642025 + 17113349124 = 103955^2 + 130818^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27919991149 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 (27919991549) 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, 184174 + ... + 299599.

It is an arithmetic number, because the mean of its divisors is an integer number (6980133159).

Almost surely, 2^27919991149 is an apocalyptic number.

It is an amenable number.

27919991149 is a deficient number, since it is larger than the sum of its proper divisors (541487).

27919991149 is an equidigital number, since it uses as much as digits as its factorization.

27919991149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541486.

The product of its digits is 3306744, while the sum is 61.

The spelling of 27919991149 in words is "twenty-seven billion, nine hundred nineteen million, nine hundred ninety-one thousand, one hundred forty-nine".