2131279 has 4 divisors (see below), whose sum is σ = 2166280. Its totient is φ = 2096280.

The previous prime is 2131271. The next prime is 2131291. The reversal of 2131279 is 9721312.

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 2131279 - 2³ = 2131271 is a prime.

It is a Duffinian number.

2131279 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131271) 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, 17409 + ... + 17530.

It is an arithmetic number, because the mean of its divisors is an integer number (541570).

2^2131279 is an apocalyptic number.

2131279 is a deficient number, since it is larger than the sum of its proper divisors (35001).

2131279 is an equidigital number, since it uses as much as digits as its factorization.

2131279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35000.

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

The square root of 2131279 is about 1459.8900643542. The cubic root of 2131279 is about 128.6905830718.

The spelling of 2131279 in words is "two million, one hundred thirty-one thousand, two hundred seventy-nine".