499991649 has 4 divisors (see below), whose sum is σ = 666655536. Its totient is φ = 333327764.

The previous prime is 499991647. The next prime is 499991651. The reversal of 499991649 is 946199994.

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 an interprime number because it is at equal distance from previous prime (499991647) and next prime (499991651).

It is a cyclic number.

It is not a de Polignac number, because 499991649 - 2¹ = 499991647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 499991592 and 499991601.

It is not an unprimeable number, because it can be changed into a prime (499991647) 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, 83331939 + ... + 83331944.

It is an arithmetic number, because the mean of its divisors is an integer number (166663884).

Almost surely, 2^499991649 is an apocalyptic number.

It is an amenable number.

499991649 is a deficient number, since it is larger than the sum of its proper divisors (166663887).

499991649 is a wasteful number, since it uses less digits than its factorization.

499991649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166663886.

The product of its digits is 5668704, while the sum is 60.

The square root of 499991649 is about 22360.4930401814. The cubic root of 499991649 is about 793.6961071641.

The spelling of 499991649 in words is "four hundred ninety-nine million, nine hundred ninety-one thousand, six hundred forty-nine".