6425781249 has 4 divisors (see below), whose sum is σ = 8567708336. Its totient is φ = 4283854164.

The previous prime is 6425781223. The next prime is 6425781253. The reversal of 6425781249 is 9421875246.

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 trimorphic number since its cube, 265324778730974960346425781249, ends in 6425781249.

It is not a de Polignac number, because 6425781249 - 2⁵ = 6425781217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6425781198 and 6425781207.

It is not an unprimeable number, because it can be changed into a prime (6425781289) 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, 1070963539 + ... + 1070963544.

It is an arithmetic number, because the mean of its divisors is an integer number (2141927084).

Almost surely, 2^6425781249 is an apocalyptic number.

It is an amenable number.

6425781249 is a deficient number, since it is larger than the sum of its proper divisors (2141927087).

6425781249 is a wasteful number, since it uses less digits than its factorization.

6425781249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141927086.

The product of its digits is 967680, while the sum is 48.

The square root of 6425781249 is about 80160.9708586417. The cubic root of 6425781249 is about 1859.1252341087.

The spelling of 6425781249 in words is "six billion, four hundred twenty-five million, seven hundred eighty-one thousand, two hundred forty-nine".