899678561 has 2 divisors, whose sum is σ = 899678562. Its totient is φ = 899678560.

The previous prime is 899678531. The next prime is 899678581. The reversal of 899678561 is 165876998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 898140961 + 1537600 = 29969^2 + 1240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-899678561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 899678561.

It is not a weakly prime, because it can be changed into another prime (899678531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449839280 + 449839281.

It is an arithmetic number, because the mean of its divisors is an integer number (449839281).

Almost surely, 2^899678561 is an apocalyptic number.

It is an amenable number.

899678561 is a deficient number, since it is larger than the sum of its proper divisors (1).

899678561 is an equidigital number, since it uses as much as digits as its factorization.

899678561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 59.

The square root of 899678561 is about 29994.6422049005. The cubic root of 899678561 is about 965.3744279772.

The spelling of 899678561 in words is "eight hundred ninety-nine million, six hundred seventy-eight thousand, five hundred sixty-one".