12478551 has 4 divisors (see below), whose sum is σ = 16638072. Its totient is φ = 8319032.

The previous prime is 12478541. The next prime is 12478567. The reversal of 12478551 is 15587421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12478551 - 2⁵ = 12478519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12478511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2079756 + ... + 2079761.

It is an arithmetic number, because the mean of its divisors is an integer number (4159518).

Almost surely, 2^12478551 is an apocalyptic number.

12478551 is a deficient number, since it is larger than the sum of its proper divisors (4159521).

12478551 is an equidigital number, since it uses as much as digits as its factorization.

12478551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159520.

The product of its digits is 11200, while the sum is 33.

The square root of 12478551 is about 3532.4992569001. The cubic root of 12478551 is about 231.9466224307.

The spelling of 12478551 in words is "twelve million, four hundred seventy-eight thousand, five hundred fifty-one".