1691894853 has 24 divisors (see below), whose sum is σ = 2670164640. Its totient is φ = 1023795360.

The previous prime is 1691894837. The next prime is 1691894857. The reversal of 1691894853 is 3584981961.

It is not a de Polignac number, because 1691894853 - 2⁴ = 1691894837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1691894853.

It is a congruent number.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52275 + ... + 78207.

It is an arithmetic number, because the mean of its divisors is an integer number (111256860).

Almost surely, 2^1691894853 is an apocalyptic number.

It is an amenable number.

1691894853 is a deficient number, since it is larger than the sum of its proper divisors (978269787).

1691894853 is a wasteful number, since it uses less digits than its factorization.

1691894853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26609 (or 26606 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 1691894853 is about 41132.6494770274. The cubic root of 1691894853 is about 1191.5834329290.

The spelling of 1691894853 in words is "one billion, six hundred ninety-one million, eight hundred ninety-four thousand, eight hundred fifty-three".