1691894852 has 12 divisors (see below), whose sum is σ = 2962330476. Its totient is φ = 845514720.

The previous prime is 1691894837. The next prime is 1691894857. The reversal of 1691894852 is 2584981961.

It can be written as a sum of positive squares in 2 ways, for example, as 851822596 + 840072256 = 29186^2 + 28984^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1691894794 and 1691894803.

It is not an unprimeable number, because it can be changed into a prime (1691894857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99299 + ... + 115082.

It is an arithmetic number, because the mean of its divisors is an integer number (246860873).

Almost surely, 2^1691894852 is an apocalyptic number.

It is an amenable number.

1691894852 is a deficient number, since it is larger than the sum of its proper divisors (1270435624).

1691894852 is a wasteful number, since it uses less digits than its factorization.

1691894852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216358 (or 216356 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 53.

The square root of 1691894852 is about 41132.6494648716. The cubic root of 1691894852 is about 1191.5834326942.

The spelling of 1691894852 in words is "one billion, six hundred ninety-one million, eight hundred ninety-four thousand, eight hundred fifty-two".