1691608748 has 6 divisors (see below), whose sum is σ = 2960315316. Its totient is φ = 845804372.

The previous prime is 1691608747. The next prime is 1691608753. The reversal of 1691608748 is 8478061961.

It is a junction number, because it is equal to n+sod(n) for n = 1691608696 and 1691608705.

It is not an unprimeable number, because it can be changed into a prime (1691608747) 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 as a sum of consecutive naturals, namely, 211451090 + ... + 211451097.

It is an arithmetic number, because the mean of its divisors is an integer number (493385886).

Almost surely, 2^1691608748 is an apocalyptic number.

It is an amenable number.

1691608748 is a deficient number, since it is larger than the sum of its proper divisors (1268706568).

1691608748 is a wasteful number, since it uses less digits than its factorization.

1691608748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422902191 (or 422902189 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 1691608748 is about 41129.1714966397. The cubic root of 1691608748 is about 1191.5162622464.

The spelling of 1691608748 in words is "one billion, six hundred ninety-one million, six hundred eight thousand, seven hundred forty-eight".