2149654879 has 4 divisors (see below), whose sum is σ = 2276105184. Its totient is φ = 2023204576.

The previous prime is 2149654861. The next prime is 2149654907. The reversal of 2149654879 is 9784569412.

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

It is a cyclic number.

It is not a de Polignac number, because 2149654879 - 2⁵ = 2149654847 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 (2149654079) 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 3 ways as a sum of consecutive naturals, for example, 63225127 + ... + 63225160.

It is an arithmetic number, because the mean of its divisors is an integer number (569026296).

Almost surely, 2^2149654879 is an apocalyptic number.

2149654879 is a deficient number, since it is larger than the sum of its proper divisors (126450305).

2149654879 is a wasteful number, since it uses less digits than its factorization.

2149654879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126450304.

The product of its digits is 4354560, while the sum is 55.

The square root of 2149654879 is about 46364.3707926679. The cubic root of 2149654879 is about 1290.5938173097.

The spelling of 2149654879 in words is "two billion, one hundred forty-nine million, six hundred fifty-four thousand, eight hundred seventy-nine".