899997949 has 2 divisors, whose sum is σ = 899997950. Its totient is φ = 899997948.

The previous prime is 899997911. The next prime is 899997961. The reversal of 899997949 is 949799998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634536100 + 265461849 = 25190^2 + 16293^2 .

It is a cyclic number.

It is not a de Polignac number, because 899997949 - 2¹⁵ = 899965181 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (899992949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449998974 + 449998975.

It is an arithmetic number, because the mean of its divisors is an integer number (449998975).

Almost surely, 2^899997949 is an apocalyptic number.

It is an amenable number.

899997949 is a deficient number, since it is larger than the sum of its proper divisors (1).

899997949 is an equidigital number, since it uses as much as digits as its factorization.

899997949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 119042784, while the sum is 73.

The square root of 899997949 is about 29999.9658166472. The cubic root of 899997949 is about 965.4886511907.

The spelling of 899997949 in words is "eight hundred ninety-nine million, nine hundred ninety-seven thousand, nine hundred forty-nine".