1649688573 has 8 divisors (see below), whose sum is σ = 2368783648. Its totient is φ = 1015192944.

The previous prime is 1649688569. The next prime is 1649688581. The reversal of 1649688573 is 3758869461.

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

It is not a de Polignac number, because 1649688573 - 2² = 1649688569 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 (1649688503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21149815 + ... + 21149892.

It is an arithmetic number, because the mean of its divisors is an integer number (296097956).

Almost surely, 2^1649688573 is an apocalyptic number.

1649688573 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1649688573 is a deficient number, since it is larger than the sum of its proper divisors (719095075).

1649688573 is a wasteful number, since it uses less digits than its factorization.

1649688573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42299723.

The product of its digits is 8709120, while the sum is 57.

The square root of 1649688573 is about 40616.3584409041. The cubic root of 1649688573 is about 1181.5914018261.

The spelling of 1649688573 in words is "one billion, six hundred forty-nine million, six hundred eighty-eight thousand, five hundred seventy-three".