2135691 has 12 divisors (see below), whose sum is σ = 3098160. Its totient is φ = 1417680.

The previous prime is 2135689. The next prime is 2135699. The reversal of 2135691 is 1965312.

It is not a de Polignac number, because 2135691 - 2¹ = 2135689 is a prime.

It is a super-2 number, since 2×2135691² = 9122352094962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2135699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2901 + ... + 3561.

It is an arithmetic number, because the mean of its divisors is an integer number (258180).

2^2135691 is an apocalyptic number.

2135691 is a deficient number, since it is larger than the sum of its proper divisors (962469).

2135691 is a wasteful number, since it uses less digits than its factorization.

2135691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026 (or 1023 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 2135691 is about 1461.4003558231. The cubic root of 2135691 is about 128.7793234494.

The spelling of 2135691 in words is "two million, one hundred thirty-five thousand, six hundred ninety-one".