1640107549 has 8 divisors (see below), whose sum is σ = 1669734648. Its totient is φ = 1610568960.

The previous prime is 1640107523. The next prime is 1640107559. The reversal of 1640107549 is 9457010461.

It can be written as a sum of positive squares in 4 ways, for example, as 187964100 + 1452143449 = 13710^2 + 38107^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1640107549 - 2¹⁹ = 1639583261 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 (1640107519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15849 + ... + 59425.

It is an arithmetic number, because the mean of its divisors is an integer number (208716831).

Almost surely, 2^1640107549 is an apocalyptic number.

It is an amenable number.

1640107549 is a deficient number, since it is larger than the sum of its proper divisors (29627099).

1640107549 is an equidigital number, since it uses as much as digits as its factorization.

1640107549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44255.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 1640107549 is about 40498.2413074938. The cubic root of 1640107549 is about 1179.2994858265.

The spelling of 1640107549 in words is "one billion, six hundred forty million, one hundred seven thousand, five hundred forty-nine".