2148578791 has 2 divisors, whose sum is σ = 2148578792. Its totient is φ = 2148578790.

The previous prime is 2148578749. The next prime is 2148578899. The reversal of 2148578791 is 1978758412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2148578791 is a prime.

It is a super-2 number, since 2×2148578791² = 9232781642270043362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2148578491) 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 as a sum of consecutive naturals, namely, 1074289395 + 1074289396.

It is an arithmetic number, because the mean of its divisors is an integer number (1074289396).

Almost surely, 2^2148578791 is an apocalyptic number.

2148578791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2148578791 is an equidigital number, since it uses as much as digits as its factorization.

2148578791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 52.

The square root of 2148578791 is about 46352.7646532545. The cubic root of 2148578791 is about 1290.3784301275.

The spelling of 2148578791 in words is "two billion, one hundred forty-eight million, five hundred seventy-eight thousand, seven hundred ninety-one".