8911521401 has 2 divisors, whose sum is σ = 8911521402. Its totient is φ = 8911521400.

The previous prime is 8911521391. The next prime is 8911521403. The reversal of 8911521401 is 1041251198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7253077225 + 1658444176 = 85165^2 + 40724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8911521401 is a prime.

It is a Sophie Germain prime.

Together with 8911521403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8911521403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4455760700 + 4455760701.

It is an arithmetic number, because the mean of its divisors is an integer number (4455760701).

Almost surely, 2^8911521401 is an apocalyptic number.

It is an amenable number.

8911521401 is a deficient number, since it is larger than the sum of its proper divisors (1).

8911521401 is an equidigital number, since it uses as much as digits as its factorization.

8911521401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 8911521401 is about 94400.8548743071. The cubic root of 8911521401 is about 2073.2449591994.

Adding to 8911521401 its reverse (1041251198), we get a palindrome (9952772599).

The spelling of 8911521401 in words is "eight billion, nine hundred eleven million, five hundred twenty-one thousand, four hundred one".