12561379 has 4 divisors (see below), whose sum is σ = 12994560. Its totient is φ = 12128200.

The previous prime is 12561359. The next prime is 12561383. The reversal of 12561379 is 97316521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97316521 = 419 ⋅232259.

It is a cyclic number.

It is not a de Polignac number, because 12561379 - 2¹⁷ = 12430307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12561349) 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, 216547 + ... + 216604.

It is an arithmetic number, because the mean of its divisors is an integer number (3248640).

Almost surely, 2^12561379 is an apocalyptic number.

12561379 is a deficient number, since it is larger than the sum of its proper divisors (433181).

12561379 is an equidigital number, since it uses as much as digits as its factorization.

12561379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433180.

The product of its digits is 11340, while the sum is 34.

The square root of 12561379 is about 3544.2035776744. The cubic root of 12561379 is about 232.4586830655.

It can be divided in two parts, 125 and 61379, that added together give a square (61504 = 248²).

The spelling of 12561379 in words is "twelve million, five hundred sixty-one thousand, three hundred seventy-nine".