2131389 has 12 divisors (see below), whose sum is σ = 3315676. Its totient is φ = 1311552.

The previous prime is 2131373. The next prime is 2131399. The reversal of 2131389 is 9831312.

It can be written as a sum of positive squares in 2 ways, for example, as 396900 + 1734489 = 630^2 + 1317^2 .

It is not a de Polignac number, because 2131389 - 2⁴ = 2131373 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 3⁶ + 1 + 3⁶ + 8⁵ + 9 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8992 + ... + 9225.

2^2131389 is an apocalyptic number.

It is an amenable number.

2131389 is a deficient number, since it is larger than the sum of its proper divisors (1184287).

2131389 is a wasteful number, since it uses less digits than its factorization.

2131389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18236 (or 18233 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 2131389 is about 1459.9277379377. The cubic root of 2131389 is about 128.6927970351.

The spelling of 2131389 in words is "two million, one hundred thirty-one thousand, three hundred eighty-nine".