899819647 has 2 divisors, whose sum is σ = 899819648. Its totient is φ = 899819646.

The previous prime is 899819633. The next prime is 899819663. The reversal of 899819647 is 746918998.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-899819647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (899619647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449909823 + 449909824.

It is an arithmetic number, because the mean of its divisors is an integer number (449909824).

Almost surely, 2^899819647 is an apocalyptic number.

899819647 is a deficient number, since it is larger than the sum of its proper divisors (1).

899819647 is an equidigital number, since it uses as much as digits as its factorization.

899819647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 61.

The square root of 899819647 is about 29996.9939660627. The cubic root of 899819647 is about 965.4248881095.

The spelling of 899819647 in words is "eight hundred ninety-nine million, eight hundred nineteen thousand, six hundred forty-seven".