1649731799 has 8 divisors (see below), whose sum is σ = 1768887360. Its totient is φ = 1533033216.

The previous prime is 1649731777. The next prime is 1649731813. The reversal of 1649731799 is 9971379461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1649731799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649730799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612854 + ... + 615539.

It is an arithmetic number, because the mean of its divisors is an integer number (221110920).

Almost surely, 2^1649731799 is an apocalyptic number.

1649731799 is a deficient number, since it is larger than the sum of its proper divisors (119155561).

1649731799 is a wasteful number, since it uses less digits than its factorization.

1649731799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228489.

The product of its digits is 2571912, while the sum is 56.

The square root of 1649731799 is about 40616.8905629173. The cubic root of 1649731799 is about 1181.6017219606.

The spelling of 1649731799 in words is "one billion, six hundred forty-nine million, seven hundred thirty-one thousand, seven hundred ninety-nine".