999457549 has 2 divisors, whose sum is σ = 999457550. Its totient is φ = 999457548.

The previous prime is 999457499. The next prime is 999457573. The reversal of 999457549 is 945754999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656281924 + 343175625 = 25618^2 + 18525^2 .

It is a cyclic number.

It is not a de Polignac number, because 999457549 - 2⁹ = 999457037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999457649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499728774 + 499728775.

It is an arithmetic number, because the mean of its divisors is an integer number (499728775).

Almost surely, 2^999457549 is an apocalyptic number.

It is an amenable number.

999457549 is a deficient number, since it is larger than the sum of its proper divisors (1).

999457549 is an equidigital number, since it uses as much as digits as its factorization.

999457549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18370800, while the sum is 61.

The square root of 999457549 is about 31614.1985348356. The cubic root of 999457549 is about 999.8191502954.

The spelling of 999457549 in words is "nine hundred ninety-nine million, four hundred fifty-seven thousand, five hundred forty-nine".