12641551 has 4 divisors (see below), whose sum is σ = 13613992. Its totient is φ = 11669112.

The previous prime is 12641549. The next prime is 12641561. The reversal of 12641551 is 15514621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15514621 = 19 ⋅816559.

It is not a de Polignac number, because 12641551 - 2¹ = 12641549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12641561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486201 + ... + 486226.

It is an arithmetic number, because the mean of its divisors is an integer number (3403498).

Almost surely, 2^12641551 is an apocalyptic number.

12641551 is a deficient number, since it is larger than the sum of its proper divisors (972441).

12641551 is an equidigital number, since it uses as much as digits as its factorization.

12641551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972440.

The product of its digits is 1200, while the sum is 25.

The square root of 12641551 is about 3555.4958866521. The cubic root of 12641551 is about 232.9521843096.

The spelling of 12641551 in words is "twelve million, six hundred forty-one thousand, five hundred fifty-one".