1681855469 has 12 divisors (see below), whose sum is σ = 1965728448. Its totient is φ = 1434749400.

The previous prime is 1681855459. The next prime is 1681855481. The reversal of 1681855469 is 9645581861.

It is not a de Polignac number, because 1681855469 - 2¹⁶ = 1681789933 is a prime.

It is a super-2 number, since 2×1681855469² = 5657275637210419922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1681855469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681855459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70997 + ... + 91674.

It is an arithmetic number, because the mean of its divisors is an integer number (163810704).

Almost surely, 2^1681855469 is an apocalyptic number.

It is an amenable number.

1681855469 is a deficient number, since it is larger than the sum of its proper divisors (283872979).

1681855469 is a wasteful number, since it uses less digits than its factorization.

1681855469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162896 (or 162889 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 53.

The square root of 1681855469 is about 41010.4312218245. The cubic root of 1681855469 is about 1189.2218788537.

The spelling of 1681855469 in words is "one billion, six hundred eighty-one million, eight hundred fifty-five thousand, four hundred sixty-nine".