2135020581 has 6 divisors (see below), whose sum is σ = 3083918630. Its totient is φ = 1423347048.

The previous prime is 2135020523. The next prime is 2135020603. The reversal of 2135020581 is 1850205312.

It is a happy number.

2135020581 is a `hidden beast` number, since 2 + 13 + 50 + 20 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1864944225 + 270076356 = 43185^2 + 16434^2 .

It is not a de Polignac number, because 2135020581 - 2⁷ = 2135020453 is a prime.

It is a super-2 number, since 2×2135020581² = 9116625762587155122, 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 (2135520581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118612246 + ... + 118612263.

Almost surely, 2^2135020581 is an apocalyptic number.

It is an amenable number.

2135020581 is a deficient number, since it is larger than the sum of its proper divisors (948898049).

2135020581 is a wasteful number, since it uses less digits than its factorization.

2135020581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237224515 (or 237224512 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2135020581 is about 46206.2829169367. The cubic root of 2135020581 is about 1287.6584691487.

Adding to 2135020581 its reverse (1850205312), we get a palindrome (3985225893).

The spelling of 2135020581 in words is "two billion, one hundred thirty-five million, twenty thousand, five hundred eighty-one".