1691669044 has 36 divisors (see below), whose sum is σ = 3345070176. Its totient is φ = 746816928.

The previous prime is 1691669041. The next prime is 1691669051. The reversal of 1691669044 is 4409661961.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 1691668985 and 1691669003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691669041) 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, 38854 + ... + 69949.

It is an arithmetic number, because the mean of its divisors is an integer number (92918616).

Almost surely, 2^1691669044 is an apocalyptic number.

It is an amenable number.

1691669044 is a deficient number, since it is larger than the sum of its proper divisors (1653401132).

1691669044 is a wasteful number, since it uses less digits than its factorization.

1691669044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108856 (or 108841 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1691669044 is about 41129.9044978225. The cubic root of 1691669044 is about 1191.5304189500.

The spelling of 1691669044 in words is "one billion, six hundred ninety-one million, six hundred sixty-nine thousand, forty-four".