8725577891 has 2 divisors, whose sum is σ = 8725577892. Its totient is φ = 8725577890.

The previous prime is 8725577851. The next prime is 8725577923. The reversal of 8725577891 is 1987755278.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8725577891 is a prime.

It is a super-2 number, since 2×8725577891² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8725577891.

It is not a weakly prime, because it can be changed into another prime (8725577821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4362788945 + 4362788946.

It is an arithmetic number, because the mean of its divisors is an integer number (4362788946).

Almost surely, 2^8725577891 is an apocalyptic number.

8725577891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8725577891 is an equidigital number, since it uses as much as digits as its factorization.

8725577891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9878400, while the sum is 59.

The square root of 8725577891 is about 93410.8017897288. The cubic root of 8725577891 is about 2058.7237115029.

The spelling of 8725577891 in words is "eight billion, seven hundred twenty-five million, five hundred seventy-seven thousand, eight hundred ninety-one".