12531397 has 8 divisors (see below), whose sum is σ = 13305816. Its totient is φ = 11761152.

The previous prime is 12531391. The next prime is 12531437. The reversal of 12531397 is 79313521.

It can be written as a sum of positive squares in 4 ways, for example, as 6548481 + 5982916 = 2559^2 + 2446^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12531397 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 (12531391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6963 + ... + 8575.

It is an arithmetic number, because the mean of its divisors is an integer number (1663227).

Almost surely, 2^12531397 is an apocalyptic number.

12531397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12531397 is a deficient number, since it is larger than the sum of its proper divisors (774419).

12531397 is a wasteful number, since it uses less digits than its factorization.

12531397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087.

The product of its digits is 5670, while the sum is 31.

The square root of 12531397 is about 3539.9713275675. The cubic root of 12531397 is about 232.2735885073.

The spelling of 12531397 in words is "twelve million, five hundred thirty-one thousand, three hundred ninety-seven".