2131869 has 4 divisors (see below), whose sum is σ = 2842496. Its totient is φ = 1421244.

The previous prime is 2131867. The next prime is 2131907. The reversal of 2131869 is 9681312.

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 2131869 - 2¹ = 2131867 is a prime.

It is a super-2 number, since 2×2131869² = 9089730866322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

2131869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131867) 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, 355309 + ... + 355314.

It is an arithmetic number, because the mean of its divisors is an integer number (710624).

2^2131869 is an apocalyptic number.

It is an amenable number.

2131869 is a deficient number, since it is larger than the sum of its proper divisors (710627).

2131869 is an equidigital number, since it uses as much as digits as its factorization.

2131869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710626.

The product of its digits is 2592, while the sum is 30.

The square root of 2131869 is about 1460.0921203815. The cubic root of 2131869 is about 128.7024570747.

The spelling of 2131869 in words is "two million, one hundred thirty-one thousand, eight hundred sixty-nine".