11619561 has 8 divisors (see below), whose sum is σ = 15785280. Its totient is φ = 7600112.

The previous prime is 11619547. The next prime is 11619571. The reversal of 11619561 is 16591611.

11619561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11619561 - 2⁵ = 11619529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11619511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36381 + ... + 36698.

It is an arithmetic number, because the mean of its divisors is an integer number (1973160).

Almost surely, 2^11619561 is an apocalyptic number.

It is an amenable number.

11619561 is a deficient number, since it is larger than the sum of its proper divisors (4165719).

11619561 is an equidigital number, since it uses as much as digits as its factorization.

11619561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73135.

The product of its digits is 1620, while the sum is 30.

The square root of 11619561 is about 3408.7477172710. The cubic root of 11619561 is about 226.4974099280.

The spelling of 11619561 in words is "eleven million, six hundred nineteen thousand, five hundred sixty-one".