2115386581 has 8 divisors (see below), whose sum is σ = 2637365184. Its totient is φ = 1648353120.

The previous prime is 2115386579. The next prime is 2115386597. The reversal of 2115386581 is 1856835112.

It is a happy number.

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 2115386581 - 2¹ = 2115386579 is a prime.

It is a super-2 number, since 2×2115386581² = 8949720774149739122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115386501) 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, 13736200 + ... + 13736353.

It is an arithmetic number, because the mean of its divisors is an integer number (329670648).

Almost surely, 2^2115386581 is an apocalyptic number.

It is an amenable number.

2115386581 is a deficient number, since it is larger than the sum of its proper divisors (521978603).

2115386581 is a wasteful number, since it uses less digits than its factorization.

2115386581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27472571.

The product of its digits is 57600, while the sum is 40.

The square root of 2115386581 is about 45993.3319188771. The cubic root of 2115386581 is about 1283.6991343947.

The spelling of 2115386581 in words is "two billion, one hundred fifteen million, three hundred eighty-six thousand, five hundred eighty-one".