2135879691 has 16 divisors (see below), whose sum is σ = 3108751488. Its totient is φ = 1293632000.

The previous prime is 2135879663. The next prime is 2135879719. The reversal of 2135879691 is 1969785312.

It is an interprime number because it is at equal distance from previous prime (2135879663) and next prime (2135879719).

It is a cyclic number.

It is not a de Polignac number, because 2135879691 - 2⁷ = 2135879563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2135879191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32620 + ... + 73046.

It is an arithmetic number, because the mean of its divisors is an integer number (194296968).

Almost surely, 2^2135879691 is an apocalyptic number.

2135879691 is a deficient number, since it is larger than the sum of its proper divisors (972871797).

2135879691 is a wasteful number, since it uses less digits than its factorization.

2135879691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42042.

The product of its digits is 816480, while the sum is 51.

The square root of 2135879691 is about 46215.5784449356. The cubic root of 2135879691 is about 1287.8311594310.

The spelling of 2135879691 in words is "two billion, one hundred thirty-five million, eight hundred seventy-nine thousand, six hundred ninety-one".