1649659733 has 4 divisors (see below), whose sum is σ = 1652519340. Its totient is φ = 1646800128.

The previous prime is 1649659717. The next prime is 1649659741. The reversal of 1649659733 is 3379569461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3379569461 = 11717 ⋅288433.

It can be written as a sum of positive squares in 2 ways, for example, as 1386668644 + 262991089 = 37238^2 + 16217^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649659733 - 2⁴ = 1649659717 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 (1649659703) 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 in 3 ways as a sum of consecutive naturals, for example, 1428938 + ... + 1430091.

It is an arithmetic number, because the mean of its divisors is an integer number (413129835).

Almost surely, 2^1649659733 is an apocalyptic number.

It is an amenable number.

1649659733 is a deficient number, since it is larger than the sum of its proper divisors (2859607).

1649659733 is an equidigital number, since it uses as much as digits as its factorization.

1649659733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859606.

The product of its digits is 3674160, while the sum is 53.

The square root of 1649659733 is about 40616.0034099861. The cubic root of 1649659733 is about 1181.5845162246.

The spelling of 1649659733 in words is "one billion, six hundred forty-nine million, six hundred fifty-nine thousand, seven hundred thirty-three".