2538656909 has 4 divisors (see below), whose sum is σ = 2539025916. Its totient is φ = 2538287904.

The previous prime is 2538656881. The next prime is 2538656927. The reversal of 2538656909 is 9096568352.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2105892100 + 432764809 = 45890^2 + 20803^2 .

It is a cyclic number.

It is not a de Polignac number, because 2538656909 - 2¹² = 2538652813 is a prime.

It is a super-2 number, since 2×2538656909² = 12889557803226868562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2538656969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173984 + ... + 188009.

It is an arithmetic number, because the mean of its divisors is an integer number (634756479).

Almost surely, 2^2538656909 is an apocalyptic number.

It is an amenable number.

2538656909 is a deficient number, since it is larger than the sum of its proper divisors (369007).

2538656909 is an equidigital number, since it uses as much as digits as its factorization.

2538656909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369006.

The product of its (nonzero) digits is 3499200, while the sum is 53.

The square root of 2538656909 is about 50385.0861763677. The cubic root of 2538656909 is about 1364.1684584597.

The spelling of 2538656909 in words is "two billion, five hundred thirty-eight million, six hundred fifty-six thousand, nine hundred nine".