819497449 has 4 divisors (see below), whose sum is σ = 819619200. Its totient is φ = 819375700.

The previous prime is 819497447. The next prime is 819497491. The reversal of 819497449 is 944794918.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 819497449 - 2¹ = 819497447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 819497449.

It is not an unprimeable number, because it can be changed into a prime (819497447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50149 + ... + 64450.

It is an arithmetic number, because the mean of its divisors is an integer number (204904800).

Almost surely, 2^819497449 is an apocalyptic number.

It is an amenable number.

819497449 is a deficient number, since it is larger than the sum of its proper divisors (121751).

819497449 is a wasteful number, since it uses less digits than its factorization.

819497449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121750.

The product of its digits is 2612736, while the sum is 55.

The square root of 819497449 is about 28626.8658605863. The cubic root of 819497449 is about 935.7989107211.

It can be divided in two parts, 81949 and 7449, that added together give a palindrome (89398).

The spelling of 819497449 in words is "eight hundred nineteen million, four hundred ninety-seven thousand, four hundred forty-nine".