1691894854 has 16 divisors (see below), whose sum is σ = 2773855728. Its totient is φ = 769218912.

The previous prime is 1691894837. The next prime is 1691894857. The reversal of 1691894854 is 4584981961.

It is a junction number, because it is equal to n+sod(n) for n = 1691894795 and 1691894804.

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 7 ways as a sum of consecutive naturals, for example, 483877 + ... + 487360.

It is an arithmetic number, because the mean of its divisors is an integer number (173365983).

Almost surely, 2^1691894854 is an apocalyptic number.

1691894854 is a deficient number, since it is larger than the sum of its proper divisors (1081960874).

1691894854 is a wasteful number, since it uses less digits than its factorization.

1691894854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971319.

The product of its digits is 2488320, while the sum is 55.

The square root of 1691894854 is about 41132.6494891832. The cubic root of 1691894854 is about 1191.5834331638.

The spelling of 1691894854 in words is "one billion, six hundred ninety-one million, eight hundred ninety-four thousand, eight hundred fifty-four".