1680602749 has 4 divisors (see below), whose sum is σ = 1920688864. Its totient is φ = 1440516636.

The previous prime is 1680602743. The next prime is 1680602761. The reversal of 1680602749 is 9472060861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9472060861 = 19 ⋅498529519.

It is a cyclic number.

It is not a de Polignac number, because 1680602749 - 2⁹ = 1680602237 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 (1680602743) 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 3 ways as a sum of consecutive naturals, for example, 120043047 + ... + 120043060.

It is an arithmetic number, because the mean of its divisors is an integer number (480172216).

Almost surely, 2^1680602749 is an apocalyptic number.

It is an amenable number.

1680602749 is a deficient number, since it is larger than the sum of its proper divisors (240086115).

1680602749 is an equidigital number, since it uses as much as digits as its factorization.

1680602749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240086114.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1680602749 is about 40995.1551893635. The cubic root of 1680602749 is about 1188.9265439111.

The spelling of 1680602749 in words is "one billion, six hundred eighty million, six hundred two thousand, seven hundred forty-nine".