12147551 has 6 divisors (see below), whose sum is σ = 13154040. Its totient is φ = 11212968.

The previous prime is 12147539. The next prime is 12147559. The reversal of 12147551 is 15574121.

It is not a de Polignac number, because 12147551 - 2¹⁰ = 12146527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12147551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12147559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35771 + ... + 36108.

It is an arithmetic number, because the mean of its divisors is an integer number (2192340).

Almost surely, 2^12147551 is an apocalyptic number.

12147551 is a deficient number, since it is larger than the sum of its proper divisors (1006489).

12147551 is an equidigital number, since it uses as much as digits as its factorization.

12147551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71905 (or 71892 counting only the distinct ones).

The product of its digits is 1400, while the sum is 26.

The square root of 12147551 is about 3485.3336999490. Note that the first 3 decimals coincide. The cubic root of 12147551 is about 229.8773826571.

The spelling of 12147551 in words is "twelve million, one hundred forty-seven thousand, five hundred fifty-one".