2129945291 has 8 divisors (see below), whose sum is σ = 2264487840. Its totient is φ = 1998897472.

The previous prime is 2129945269. The next prime is 2129945297. The reversal of 2129945291 is 1925499212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2129945291 - 2¹⁸ = 2129683147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129945297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 872426 + ... + 874863.

It is an arithmetic number, because the mean of its divisors is an integer number (283060980).

Almost surely, 2^2129945291 is an apocalyptic number.

2129945291 is a deficient number, since it is larger than the sum of its proper divisors (134542549).

2129945291 is a wasteful number, since it uses less digits than its factorization.

2129945291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747365.

The product of its digits is 116640, while the sum is 44.

The square root of 2129945291 is about 46151.3303275214. The cubic root of 2129945291 is about 1286.6373352852.

The spelling of 2129945291 in words is "two billion, one hundred twenty-nine million, nine hundred forty-five thousand, two hundred ninety-one".