2139191 has 4 divisors (see below), whose sum is σ = 2251800. Its totient is φ = 2026584.

The previous prime is 2139167. The next prime is 2139199. The reversal of 2139191 is 1919312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2139191 - 2¹⁰ = 2138167 is a prime.

It is a super-2 number, since 2×2139191² = 9152276268962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2139191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139199) 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, 56276 + ... + 56313.

It is an arithmetic number, because the mean of its divisors is an integer number (562950).

2^2139191 is an apocalyptic number.

2139191 is a deficient number, since it is larger than the sum of its proper divisors (112609).

2139191 is a wasteful number, since it uses less digits than its factorization.

2139191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112608.

The product of its digits is 486, while the sum is 26.

The square root of 2139191 is about 1462.5973471875. The cubic root of 2139191 is about 128.8496335015.

The spelling of 2139191 in words is "two million, one hundred thirty-nine thousand, one hundred ninety-one".