12397551 has 16 divisors (see below), whose sum is σ = 17233920. Its totient is φ = 7918560.

The previous prime is 12397547. The next prime is 12397571. The reversal of 12397551 is 15579321.

It is not a de Polignac number, because 12397551 - 2² = 12397547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12397571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9526 + ... + 10748.

It is an arithmetic number, because the mean of its divisors is an integer number (1077120).

Almost surely, 2^12397551 is an apocalyptic number.

12397551 is a deficient number, since it is larger than the sum of its proper divisors (4836369).

12397551 is a wasteful number, since it uses less digits than its factorization.

12397551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366.

The product of its digits is 9450, while the sum is 33.

The square root of 12397551 is about 3521.0156205277. The cubic root of 12397551 is about 231.4436667381.

The spelling of 12397551 in words is "twelve million, three hundred ninety-seven thousand, five hundred fifty-one".