2148817491 has 40 divisors (see below), whose sum is σ = 3244104864. Its totient is φ = 1417409280.

The previous prime is 2148817477. The next prime is 2148817523. The reversal of 2148817491 is 1947188412.

2148817491 is a `hidden beast` number, since 2 + 148 + 8 + 17 + 491 = 666.

It is not a de Polignac number, because 2148817491 - 2¹⁵ = 2148784723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2148817441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4962411 + ... + 4962843.

Almost surely, 2^2148817491 is an apocalyptic number.

2148817491 is a deficient number, since it is larger than the sum of its proper divisors (1095287373).

2148817491 is a wasteful number, since it uses less digits than its factorization.

2148817491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953 (or 944 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 2148817491 is about 46355.3394011952. The cubic root of 2148817491 is about 1290.4262139505.

The spelling of 2148817491 in words is "two billion, one hundred forty-eight million, eight hundred seventeen thousand, four hundred ninety-one".