2131289 has 4 divisors (see below), whose sum is σ = 2171556. Its totient is φ = 2091024.

The previous prime is 2131271. The next prime is 2131291. The reversal of 2131289 is 9821312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1247689 + 883600 = 1117^2 + 940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2133289) 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, 20054 + ... + 20159.

It is an arithmetic number, because the mean of its divisors is an integer number (542889).

2^2131289 is an apocalyptic number.

It is an amenable number.

2131289 is a deficient number, since it is larger than the sum of its proper divisors (40267).

2131289 is an equidigital number, since it uses as much as digits as its factorization.

2131289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40266.

The product of its digits is 864, while the sum is 26.

The square root of 2131289 is about 1459.8934892656. The cubic root of 2131289 is about 128.6907843443.

The spelling of 2131289 in words is "two million, one hundred thirty-one thousand, two hundred eighty-nine".