1691608746 has 16 divisors (see below), whose sum is σ = 3404768544. Its totient is φ = 560277744.

The previous prime is 1691608729. The next prime is 1691608747. The reversal of 1691608746 is 6478061961.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1691608695 and 1691608704.

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 in 7 ways as a sum of consecutive naturals, for example, 896940 + ... + 898823.

It is an arithmetic number, because the mean of its divisors is an integer number (212798034).

Almost surely, 2^1691608746 is an apocalyptic number.

1691608746 is an abundant number, since it is smaller than the sum of its proper divisors (1713159798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691608746 is a wasteful number, since it uses less digits than its factorization.

1691608746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795925.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 1691608746 is about 41129.1714723261. The cubic root of 1691608746 is about 1191.5162617768.

It can be divided in two parts, 169160 and 8746, that added together give a triangular number (177906 = T₅₉₆).

The spelling of 1691608746 in words is "one billion, six hundred ninety-one million, six hundred eight thousand, seven hundred forty-six".