2139181 has 4 divisors (see below), whose sum is σ = 2333664. Its totient is φ = 1944700.

The previous prime is 2139167. The next prime is 2139199. The reversal of 2139181 is 1819312.

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 a cyclic number.

It is not a de Polignac number, because 2139181 - 2⁵ = 2139149 is a prime.

It is a super-2 number, since 2×2139181² = 9152190701522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139131) 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, 97225 + ... + 97246.

It is an arithmetic number, because the mean of its divisors is an integer number (583416).

2^2139181 is an apocalyptic number.

It is an amenable number.

2139181 is a deficient number, since it is larger than the sum of its proper divisors (194483).

2139181 is a wasteful number, since it uses less digits than its factorization.

2139181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194482.

The product of its digits is 432, while the sum is 25.

The square root of 2139181 is about 1462.5939286077. The cubic root of 2139181 is about 128.8494327250.

The spelling of 2139181 in words is "two million, one hundred thirty-nine thousand, one hundred eighty-one".