1642749085 has 4 divisors (see below), whose sum is σ = 1971298908. Its totient is φ = 1314199264.

The previous prime is 1642749071. The next prime is 1642749103. The reversal of 1642749085 is 5809472461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1149820281 + 492928804 = 33909^2 + 22202^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642749085 - 2¹⁹ = 1642224797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 164274904 + ... + 164274913.

It is an arithmetic number, because the mean of its divisors is an integer number (492824727).

Almost surely, 2^1642749085 is an apocalyptic number.

It is an amenable number.

1642749085 is a deficient number, since it is larger than the sum of its proper divisors (328549823).

1642749085 is an equidigital number, since it uses as much as digits as its factorization.

1642749085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328549822.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 1642749085 is about 40530.8411583081. The cubic root of 1642749085 is about 1179.9322677296.

The spelling of 1642749085 in words is "one billion, six hundred forty-two million, seven hundred forty-nine thousand, eighty-five".