2135917811 has 4 divisors (see below), whose sum is σ = 2143519224. Its totient is φ = 2128316400.

The previous prime is 2135917807. The next prime is 2135917829. The reversal of 2135917811 is 1187195312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2135917811 - 2² = 2135917807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2135917841) 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, 3800285 + ... + 3800846.

It is an arithmetic number, because the mean of its divisors is an integer number (535879806).

Almost surely, 2^2135917811 is an apocalyptic number.

2135917811 is a deficient number, since it is larger than the sum of its proper divisors (7601413).

2135917811 is an equidigital number, since it uses as much as digits as its factorization.

2135917811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7601412.

The product of its digits is 15120, while the sum is 38.

The square root of 2135917811 is about 46215.9908581435. The cubic root of 2135917811 is about 1287.8388208849.

The spelling of 2135917811 in words is "two billion, one hundred thirty-five million, nine hundred seventeen thousand, eight hundred eleven".