8429779249 has 4 divisors (see below), whose sum is σ = 8430329664. Its totient is φ = 8429228836.

The previous prime is 8429779219. The next prime is 8429779279. The reversal of 8429779249 is 9429779248.

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 an interprime number because it is at equal distance from previous prime (8429779219) and next prime (8429779279).

It is a cyclic number.

It is not a de Polignac number, because 8429779249 - 2¹¹ = 8429777201 is a prime.

It is a super-2 number, since 2×8429779249² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8429779219) 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, 251557 + ... + 283090.

It is an arithmetic number, because the mean of its divisors is an integer number (2107582416).

Almost surely, 2^8429779249 is an apocalyptic number.

It is an amenable number.

8429779249 is a deficient number, since it is larger than the sum of its proper divisors (550415).

8429779249 is a wasteful number, since it uses less digits than its factorization.

8429779249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550414.

The product of its digits is 18289152, while the sum is 61.

The square root of 8429779249 is about 91813.8292905813. The cubic root of 8429779249 is about 2035.1920646497.

Subtracting 8429779249 from its reverse (9429779248), we obtain a palindrome (999999999).

The spelling of 8429779249 in words is "eight billion, four hundred twenty-nine million, seven hundred seventy-nine thousand, two hundred forty-nine".