899687813 has 2 divisors, whose sum is σ = 899687814. Its totient is φ = 899687812.

The previous prime is 899687809. The next prime is 899687861. The reversal of 899687813 is 318786998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 821223649 + 78464164 = 28657^2 + 8858^2 .

It is a cyclic number.

It is not a de Polignac number, because 899687813 - 2² = 899687809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (899681813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449843906 + 449843907.

It is an arithmetic number, because the mean of its divisors is an integer number (449843907).

Almost surely, 2^899687813 is an apocalyptic number.

It is an amenable number.

899687813 is a deficient number, since it is larger than the sum of its proper divisors (1).

899687813 is an equidigital number, since it uses as much as digits as its factorization.

899687813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 59.

The square root of 899687813 is about 29994.7964320480. The cubic root of 899687813 is about 965.3777371641.

The spelling of 899687813 in words is "eight hundred ninety-nine million, six hundred eighty-seven thousand, eight hundred thirteen".