1681984143 has 48 divisors (see below), whose sum is σ = 2992235520. Its totient is φ = 930106800.

The previous prime is 1681984141. The next prime is 1681984163. The reversal of 1681984143 is 3414891861.

It is a Cunningham number, because it is equal to 41012²-1.

It is not a de Polignac number, because 1681984143 - 2¹ = 1681984141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681984141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20508 + ... + 61518.

It is an arithmetic number, because the mean of its divisors is an integer number (62338240).

Almost surely, 2^1681984143 is an apocalyptic number.

1681984143 is a deficient number, since it is larger than the sum of its proper divisors (1310251377).

1681984143 is a wasteful number, since it uses less digits than its factorization.

1681984143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41065 (or 41052 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 1681984143 is about 41011.9999878084. Note that the first 4 decimals coincide. The cubic root of 1681984143 is about 1189.2522060799.

The spelling of 1681984143 in words is "one billion, six hundred eighty-one million, nine hundred eighty-four thousand, one hundred forty-three".