2135861 has 16 divisors (see below), whose sum is σ = 2688000. Its totient is φ = 1686384.

The previous prime is 2135857. The next prime is 2135891. The reversal of 2135861 is 1685312.

It is not a de Polignac number, because 2135861 - 2² = 2135857 is a prime.

It is a super-2 number, since 2×2135861² = 9123804422642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2135861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135831) 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, 4220 + ... + 4698.

It is an arithmetic number, because the mean of its divisors is an integer number (168000).

2^2135861 is an apocalyptic number.

It is an amenable number.

2135861 is a deficient number, since it is larger than the sum of its proper divisors (552139).

2135861 is an equidigital number, since it uses as much as digits as its factorization.

2135861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 499 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 2135861 is about 1461.4585180565. The cubic root of 2135861 is about 128.7827402833.

The spelling of 2135861 in words is "two million, one hundred thirty-five thousand, eight hundred sixty-one".