2135181 has 4 divisors (see below), whose sum is σ = 2846912. Its totient is φ = 1423452.

The previous prime is 2135173. The next prime is 2135191. The reversal of 2135181 is 1815312.

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 not a de Polignac number, because 2135181 - 2³ = 2135173 is a prime.

It is a super-2 number, since 2×2135181² = 9117995805522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135101) 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, 355861 + ... + 355866.

It is an arithmetic number, because the mean of its divisors is an integer number (711728).

2^2135181 is an apocalyptic number.

It is an amenable number.

2135181 is a deficient number, since it is larger than the sum of its proper divisors (711731).

2135181 is an equidigital number, since it uses as much as digits as its factorization.

2135181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711730.

The product of its digits is 240, while the sum is 21.

The square root of 2135181 is about 1461.2258552325. The cubic root of 2135181 is about 128.7690718597.

The spelling of 2135181 in words is "two million, one hundred thirty-five thousand, one hundred eighty-one".