12505400291 has 4 divisors (see below), whose sum is σ = 12505871784. Its totient is φ = 12504928800.

The previous prime is 12505400273. The next prime is 12505400293. The reversal of 12505400291 is 19200450521.

12505400291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12505400291 - 2¹⁰ = 12505399267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12505400293) 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 3 ways as a sum of consecutive naturals, for example, 193430 + ... + 249851.

It is an arithmetic number, because the mean of its divisors is an integer number (3126467946).

Almost surely, 2^12505400291 is an apocalyptic number.

12505400291 is a deficient number, since it is larger than the sum of its proper divisors (471493).

12505400291 is an equidigital number, since it uses as much as digits as its factorization.

12505400291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471492.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 12505400291 in words is "twelve billion, five hundred five million, four hundred thousand, two hundred ninety-one".