8791556249 has 4 divisors (see below), whose sum is σ = 10047492864. Its totient is φ = 7535619636.

The previous prime is 8791556231. The next prime is 8791556287. The reversal of 8791556249 is 9426551978.

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 8791556249 - 2¹⁶ = 8791490713 is a prime.

It is a super-2 number, since 2×8791556249² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8791556194 and 8791556203.

It is not an unprimeable number, because it can be changed into a prime (8791556209) 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, 627968297 + ... + 627968310.

It is an arithmetic number, because the mean of its divisors is an integer number (2511873216).

Almost surely, 2^8791556249 is an apocalyptic number.

It is an amenable number.

8791556249 is a deficient number, since it is larger than the sum of its proper divisors (1255936615).

8791556249 is a wasteful number, since it uses less digits than its factorization.

8791556249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255936614.

The product of its digits is 5443200, while the sum is 56.

The square root of 8791556249 is about 93763.2990513879. The cubic root of 8791556249 is about 2063.8996926125.

The spelling of 8791556249 in words is "eight billion, seven hundred ninety-one million, five hundred fifty-six thousand, two hundred forty-nine".