899787649 has 2 divisors, whose sum is σ = 899787650. Its totient is φ = 899787648.

The previous prime is 899787619. The next prime is 899787653. The reversal of 899787649 is 946787998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 879537649 + 20250000 = 29657^2 + 4500^2 .

It is a cyclic number.

It is not a de Polignac number, because 899787649 - 2⁷ = 899787521 is a prime.

It is not a weakly prime, because it can be changed into another prime (899787619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449893824 + 449893825.

It is an arithmetic number, because the mean of its divisors is an integer number (449893825).

Almost surely, 2^899787649 is an apocalyptic number.

It is an amenable number.

899787649 is a deficient number, since it is larger than the sum of its proper divisors (1).

899787649 is an equidigital number, since it uses as much as digits as its factorization.

899787649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54867456, while the sum is 67.

The square root of 899787649 is about 29996.4606078784. The cubic root of 899787649 is about 965.4134443230.

The spelling of 899787649 in words is "eight hundred ninety-nine million, seven hundred eighty-seven thousand, six hundred forty-nine".