2689520681 has 4 divisors (see below), whose sum is σ = 2689706832. Its totient is φ = 2689334532.

The previous prime is 2689520641. The next prime is 2689520689. The reversal of 2689520681 is 1860259862.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1860259862 = 2 ⋅930129931.

It is a cyclic number.

It is not a de Polignac number, because 2689520681 - 2¹⁴ = 2689504297 is a prime.

It is a super-2 number, since 2×2689520681² = 14467042987053407522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2689520689) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 69395 + ... + 100968.

It is an arithmetic number, because the mean of its divisors is an integer number (672426708).

Almost surely, 2^2689520681 is an apocalyptic number.

It is an amenable number.

2689520681 is a deficient number, since it is larger than the sum of its proper divisors (186151).

2689520681 is a wasteful number, since it uses less digits than its factorization.

2689520681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186150.

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 2689520681 is about 51860.5888994716. The cubic root of 2689520681 is about 1390.6728073190.

The spelling of 2689520681 in words is "two billion, six hundred eighty-nine million, five hundred twenty thousand, six hundred eighty-one".