1000611681 has 4 divisors (see below), whose sum is σ = 1334148912. Its totient is φ = 667074452.

The previous prime is 1000611637. The next prime is 1000611697. The reversal of 1000611681 is 1861160001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1000611681 - 2⁹ = 1000611169 is a prime.

It is a super-2 number, since 2×1000611681² = 2002447472307291522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1000611181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166768611 + ... + 166768616.

It is an arithmetic number, because the mean of its divisors is an integer number (333537228).

Almost surely, 2^1000611681 is an apocalyptic number.

It is an amenable number.

1000611681 is a deficient number, since it is larger than the sum of its proper divisors (333537231).

1000611681 is an equidigital number, since it uses as much as digits as its factorization.

1000611681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333537230.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 1000611681 is about 31632.4466489711. The cubic root of 1000611681 is about 1000.2038521082.

Adding to 1000611681 its reverse (1861160001), we get a palindrome (2861771682).

The spelling of 1000611681 in words is "one billion, six hundred eleven thousand, six hundred eighty-one".