1681173140 has 24 divisors (see below), whose sum is σ = 3590304480. Its totient is φ = 661071008.

The previous prime is 1681173101. The next prime is 1681173203. The reversal of 1681173140 is 413711861.

It is a junction number, because it is equal to n+sod(n) for n = 1681173097 and 1681173106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711182 + ... + 713541.

It is an arithmetic number, because the mean of its divisors is an integer number (149596020).

Almost surely, 2^1681173140 is an apocalyptic number.

1681173140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681173140 is an abundant number, since it is smaller than the sum of its proper divisors (1909131340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681173140 is a wasteful number, since it uses less digits than its factorization.

1681173140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424791 (or 1424789 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1681173140 is about 41002.1114090482. Note that the first 3 decimals coincide. The cubic root of 1681173140 is about 1189.0610346058.

The spelling of 1681173140 in words is "one billion, six hundred eighty-one million, one hundred seventy-three thousand, one hundred forty".