12640351 has 2 divisors, whose sum is σ = 12640352. Its totient is φ = 12640350.

The previous prime is 12640307. The next prime is 12640373. The reversal of 12640351 is 15304621.

It is an a-pointer prime, because the next prime (12640373) can be obtained adding 12640351 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12640351 - 2⁹ = 12639839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12640451) 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 as a sum of consecutive naturals, namely, 6320175 + 6320176.

It is an arithmetic number, because the mean of its divisors is an integer number (6320176).

Almost surely, 2^12640351 is an apocalyptic number.

12640351 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640351 is an equidigital number, since it uses as much as digits as its factorization.

12640351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 12640351 is about 3555.3271298152. The cubic root of 12640351 is about 232.9448130763.

Adding to 12640351 its reverse (15304621), we get a palindrome (27944972).

The spelling of 12640351 in words is "twelve million, six hundred forty thousand, three hundred fifty-one".