12491553 has 16 divisors (see below), whose sum is σ = 17470080. Its totient is φ = 7924224.

The previous prime is 12491537. The next prime is 12491581. The reversal of 12491553 is 35519421.

It is not a de Polignac number, because 12491553 - 2⁴ = 12491537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12491553.

It is not an unprimeable number, because it can be changed into a prime (12421553) 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 15 ways as a sum of consecutive naturals, for example, 18225 + ... + 18897.

It is an arithmetic number, because the mean of its divisors is an integer number (1091880).

Almost surely, 2^12491553 is an apocalyptic number.

It is an amenable number.

12491553 is a deficient number, since it is larger than the sum of its proper divisors (4978527).

12491553 is a wasteful number, since it uses less digits than its factorization.

12491553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968.

The product of its digits is 5400, while the sum is 30.

The square root of 12491553 is about 3534.3391178550. The cubic root of 12491553 is about 232.0271532329.

The spelling of 12491553 in words is "twelve million, four hundred ninety-one thousand, five hundred fifty-three".