12531278 has 16 divisors (see below), whose sum is σ = 20203344. Its totient is φ = 5808000.

The previous prime is 12531263. The next prime is 12531283. The reversal of 12531278 is 87213521.

It is a self number, because there is not a number n which added to its sum of digits gives 12531278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473 + ... + 5028.

It is an arithmetic number, because the mean of its divisors is an integer number (1262709).

Almost surely, 2^12531278 is an apocalyptic number.

12531278 is a deficient number, since it is larger than the sum of its proper divisors (7672066).

12531278 is a wasteful number, since it uses less digits than its factorization.

12531278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5587.

The product of its digits is 3360, while the sum is 29.

The square root of 12531278 is about 3539.9545194819. The cubic root of 12531278 is about 232.2728532702.

Adding to 12531278 its reverse (87213521), we get a palindrome (99744799).

The spelling of 12531278 in words is "twelve million, five hundred thirty-one thousand, two hundred seventy-eight".