8521564123 has 2 divisors, whose sum is σ = 8521564124. Its totient is φ = 8521564122.

The previous prime is 8521564111. The next prime is 8521564133. The reversal of 8521564123 is 3214651258.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8521564123 is a prime.

It is not a weakly prime, because it can be changed into another prime (8521564133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260782061 + 4260782062.

It is an arithmetic number, because the mean of its divisors is an integer number (4260782062).

Almost surely, 2^8521564123 is an apocalyptic number.

8521564123 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521564123 is an equidigital number, since it uses as much as digits as its factorization.

8521564123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 37.

The square root of 8521564123 is about 92312.3183708437. The cubic root of 8521564123 is about 2042.5519232211.

The spelling of 8521564123 in words is "eight billion, five hundred twenty-one million, five hundred sixty-four thousand, one hundred twenty-three".