8135389249 has 4 divisors (see below), whose sum is σ = 8761188436. Its totient is φ = 7509590064.

The previous prime is 8135389181. The next prime is 8135389313. The reversal of 8135389249 is 9429835318.

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 2109748624 + 6025640625 = 45932^2 + 77625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8135389249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8135389196 and 8135389205.

It is not an unprimeable number, because it can be changed into a prime (8135389349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312899574 + ... + 312899599.

It is an arithmetic number, because the mean of its divisors is an integer number (2190297109).

Almost surely, 2^8135389249 is an apocalyptic number.

It is an amenable number.

8135389249 is a deficient number, since it is larger than the sum of its proper divisors (625799187).

8135389249 is a wasteful number, since it uses less digits than its factorization.

8135389249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625799186.

The product of its digits is 1866240, while the sum is 52.

The square root of 8135389249 is about 90196.3926606824. The cubic root of 8135389249 is about 2011.2193824591.

The spelling of 8135389249 in words is "eight billion, one hundred thirty-five million, three hundred eighty-nine thousand, two hundred forty-nine".