2539047921 has 4 divisors (see below), whose sum is σ = 3385397232. Its totient is φ = 1692698612.

The previous prime is 2539047887. The next prime is 2539047923. The reversal of 2539047921 is 1297409352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2539047921 - 2⁹ = 2539047409 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2539047923) 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 3 ways as a sum of consecutive naturals, for example, 423174651 + ... + 423174656.

It is an arithmetic number, because the mean of its divisors is an integer number (846349308).

Almost surely, 2^2539047921 is an apocalyptic number.

It is an amenable number.

2539047921 is a deficient number, since it is larger than the sum of its proper divisors (846349311).

2539047921 is an equidigital number, since it uses as much as digits as its factorization.

2539047921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846349310.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 2539047921 is about 50388.9662624666. The cubic root of 2539047921 is about 1364.2384927171.

The spelling of 2539047921 in words is "two billion, five hundred thirty-nine million, forty-seven thousand, nine hundred twenty-one".