12961619 has 16 divisors (see below), whose sum is σ = 14720640. Its totient is φ = 11309760.

The previous prime is 12961607. The next prime is 12961621. The reversal of 12961619 is 91616921.

It is not a de Polignac number, because 12961619 - 2⁴ = 12961603 is a prime.

It is a super-2 number, since 2×12961619² = 336007134202322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12961919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31487 + ... + 31895.

It is an arithmetic number, because the mean of its divisors is an integer number (920040).

Almost surely, 2^12961619 is an apocalyptic number.

12961619 is a deficient number, since it is larger than the sum of its proper divisors (1759021).

12961619 is a wasteful number, since it uses less digits than its factorization.

12961619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530.

The product of its digits is 5832, while the sum is 35.

The square root of 12961619 is about 3600.2248540890. The cubic root of 12961619 is about 234.9018391905.

The spelling of 12961619 in words is "twelve million, nine hundred sixty-one thousand, six hundred nineteen".