2135293781 has 4 divisors (see below), whose sum is σ = 2135467200. Its totient is φ = 2135120364.

The previous prime is 2135293763. The next prime is 2135293793. The reversal of 2135293781 is 1873925312.

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.

It is a cyclic number.

It is not a de Polignac number, because 2135293781 - 2³⁰ = 1061551957 is a prime.

It is a super-2 number, since 2×2135293781² = 9118959062354551922, 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 (2135293081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66701 + ... + 93378.

It is an arithmetic number, because the mean of its divisors is an integer number (533866800).

Almost surely, 2^2135293781 is an apocalyptic number.

It is an amenable number.

2135293781 is a deficient number, since it is larger than the sum of its proper divisors (173419).

2135293781 is a wasteful number, since it uses less digits than its factorization.

2135293781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173418.

The product of its digits is 90720, while the sum is 41.

The square root of 2135293781 is about 46209.2391302865. The cubic root of 2135293781 is about 1287.7133902882.

The spelling of 2135293781 in words is "two billion, one hundred thirty-five million, two hundred ninety-three thousand, seven hundred eighty-one".