12561415 has 4 divisors (see below), whose sum is σ = 15073704. Its totient is φ = 10049128.

The previous prime is 12561401. The next prime is 12561431. The reversal of 12561415 is 51416521.

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: 51416521 = 13 ⋅3955117.

It is a cyclic number.

It is not a de Polignac number, because 12561415 - 2⁵ = 12561383 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 12561415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1256137 + ... + 1256146.

It is an arithmetic number, because the mean of its divisors is an integer number (3768426).

Almost surely, 2^12561415 is an apocalyptic number.

12561415 is a deficient number, since it is larger than the sum of its proper divisors (2512289).

12561415 is an equidigital number, since it uses as much as digits as its factorization.

12561415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512288.

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

The square root of 12561415 is about 3544.2086563858. The cubic root of 12561415 is about 232.4589051352.

Adding to 12561415 its reverse (51416521), we get a palindrome (63977936).

The spelling of 12561415 in words is "twelve million, five hundred sixty-one thousand, four hundred fifteen".