13561919 has 4 divisors (see below), whose sum is σ = 15499344. Its totient is φ = 11624496.

The previous prime is 13561901. The next prime is 13561931. The reversal of 13561919 is 91916531.

13561919 is digitally balanced in base 3, 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 13561919 - 2¹⁶ = 13496383 is a prime.

It is a super-2 number, since 2×13561919² = 367851293925122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13561319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968702 + ... + 968715.

It is an arithmetic number, because the mean of its divisors is an integer number (3874836).

Almost surely, 2^13561919 is an apocalyptic number.

13561919 is a deficient number, since it is larger than the sum of its proper divisors (1937425).

13561919 is an equidigital number, since it uses as much as digits as its factorization.

13561919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937424.

The product of its digits is 7290, while the sum is 35.

The square root of 13561919 is about 3682.6510831193. The cubic root of 13561919 is about 238.4736407396.

The spelling of 13561919 in words is "thirteen million, five hundred sixty-one thousand, nine hundred nineteen".