12521531 has 8 divisors (see below), whose sum is σ = 13884528. Its totient is φ = 11196000.

The previous prime is 12521519. The next prime is 12521543. The reversal of 12521531 is 13512521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12521519) and next prime (12521543).

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

It is a cyclic number.

It is not a de Polignac number, because 12521531 - 2¹⁰ = 12520507 is a prime.

It is a super-2 number, since 2×12521531² = 313577477167922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8660 + ... + 10001.

It is an arithmetic number, because the mean of its divisors is an integer number (1735566).

Almost surely, 2^12521531 is an apocalyptic number.

12521531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12521531 is the 1583-rd centered decagonal number.

12521531 is a deficient number, since it is larger than the sum of its proper divisors (1362997).

12521531 is a wasteful number, since it uses less digits than its factorization.

12521531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18733.

The product of its digits is 300, while the sum is 20.

The square root of 12521531 is about 3538.5775390685. The cubic root of 12521531 is about 232.2126159788.

The spelling of 12521531 in words is "twelve million, five hundred twenty-one thousand, five hundred thirty-one".