2015709681 has 8 divisors (see below), whose sum is σ = 2731672384. Its totient is φ = 1321776720.

The previous prime is 2015709679. The next prime is 2015709701. The reversal of 2015709681 is 1869075102.

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

It is not a de Polignac number, because 2015709681 - 2¹ = 2015709679 is a prime.

It is a super-2 number, since 2×2015709681² = 8126171036154243522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2015709611) 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, 5507221 + ... + 5507586.

It is an arithmetic number, because the mean of its divisors is an integer number (341459048).

Almost surely, 2^2015709681 is an apocalyptic number.

It is an amenable number.

2015709681 is a deficient number, since it is larger than the sum of its proper divisors (715962703).

2015709681 is a wasteful number, since it uses less digits than its factorization.

2015709681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11014871.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 2015709681 is about 44896.6555658659. The cubic root of 2015709681 is about 1263.2112764349.

The spelling of 2015709681 in words is "two billion, fifteen million, seven hundred nine thousand, six hundred eighty-one".