1681839761 has 8 divisors (see below), whose sum is σ = 1924520640. Its totient is φ = 1439763408.

The previous prime is 1681839751. The next prime is 1681839763. The reversal of 1681839761 is 1679381861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1681839761 - 2⁶ = 1681839697 is a prime.

It is a super-5 number, since 5×1681839761⁵ (a number of 47 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (1681839763) 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, 145151 + ... + 156308.

It is an arithmetic number, because the mean of its divisors is an integer number (240565080).

Almost surely, 2^1681839761 is an apocalyptic number.

It is an amenable number.

1681839761 is a deficient number, since it is larger than the sum of its proper divisors (242680879).

1681839761 is an equidigital number, since it uses as much as digits as its factorization.

1681839761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302263.

The product of its digits is 435456, while the sum is 50.

The square root of 1681839761 is about 41010.2397091263. The cubic root of 1681839761 is about 1189.2181765230.

The spelling of 1681839761 in words is "one billion, six hundred eighty-one million, eight hundred thirty-nine thousand, seven hundred sixty-one".