1681001861 has 16 divisors (see below), whose sum is σ = 2100958080. Its totient is φ = 1306644480.

The previous prime is 1681001831. The next prime is 1681001867.

1681001861 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1681001861 - 2¹⁰ = 1681000837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681001867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4805 + ... + 58181.

It is an arithmetic number, because the mean of its divisors is an integer number (131309880).

Almost surely, 2^1681001861 is an apocalyptic number.

1681001861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1681001861 is a deficient number, since it is larger than the sum of its proper divisors (419956219).

1681001861 is a wasteful number, since it uses less digits than its factorization.

1681001861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53804.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 1681001861 is about 41000.0226951157. The cubic root of 1681001861 is about 1189.0206524669.

It can be divided in two parts, 168100 and 1861, that added together give a palindrome (169961).

The spelling of 1681001861 in words is "one billion, six hundred eighty-one million, one thousand, eight hundred sixty-one".