12531789 has 12 divisors (see below), whose sum is σ = 18591196. Its totient is φ = 8128512.

The previous prime is 12531787. The next prime is 12531809. The reversal of 12531789 is 98713521.

It can be written as a sum of positive squares in 2 ways, for example, as 7469289 + 5062500 = 2733^2 + 2250^2 .

It is not a de Polignac number, because 12531789 - 2¹ = 12531787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531787) 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, 18484 + ... + 19149.

Almost surely, 2^12531789 is an apocalyptic number.

It is an amenable number.

12531789 is a deficient number, since it is larger than the sum of its proper divisors (6059407).

12531789 is a wasteful number, since it uses less digits than its factorization.

12531789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37676 (or 37673 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 12531789 is about 3540.0266948146. The cubic root of 12531789 is about 232.2760104320.

The spelling of 12531789 in words is "twelve million, five hundred thirty-one thousand, seven hundred eighty-nine".