2139271 has 4 divisors (see below), whose sum is σ = 2147272. Its totient is φ = 2131272.

The previous prime is 2139233. The next prime is 2139283. The reversal of 2139271 is 1729312.

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 2139271 - 2⁷ = 2139143 is a prime.

It is a super-2 number, since 2×2139271² = 9152960822882, which contains 22 as substring.

It is a Duffinian number.

2139271 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139211) 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, 3585 + ... + 4138.

It is an arithmetic number, because the mean of its divisors is an integer number (536818).

2^2139271 is an apocalyptic number.

2139271 is a deficient number, since it is larger than the sum of its proper divisors (8001).

2139271 is an equidigital number, since it uses as much as digits as its factorization.

2139271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8000.

The product of its digits is 756, while the sum is 25.

The square root of 2139271 is about 1462.6246955388. The cubic root of 2139271 is about 128.8512396916.

The spelling of 2139271 in words is "two million, one hundred thirty-nine thousand, two hundred seventy-one".