2135987581 has 16 divisors (see below), whose sum is σ = 2767273600. Its totient is φ = 1601062848.

The previous prime is 2135987573. The next prime is 2135987591. The reversal of 2135987581 is 1857895312.

It is not a de Polignac number, because 2135987581 - 2³ = 2135987573 is a prime.

It is a super-2 number, since 2×2135987581² = 9124885892372463122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135987531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615966 + ... + 619423.

It is an arithmetic number, because the mean of its divisors is an integer number (172954600).

Almost surely, 2^2135987581 is an apocalyptic number.

It is an amenable number.

2135987581 is a deficient number, since it is larger than the sum of its proper divisors (631286019).

2135987581 is a wasteful number, since it uses less digits than its factorization.

2135987581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235428.

The product of its digits is 604800, while the sum is 49.

The square root of 2135987581 is about 46216.7456772975. The cubic root of 2135987581 is about 1287.8528431998.

The spelling of 2135987581 in words is "two billion, one hundred thirty-five million, nine hundred eighty-seven thousand, five hundred eighty-one".