11561387 has 4 divisors (see below), whose sum is σ = 12064080. Its totient is φ = 11058696.

The previous prime is 11561371. The next prime is 11561423. The reversal of 11561387 is 78316511.

11561387 is digitally balanced in base 2 and base 3, because in such bases 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 11561387 - 2⁴ = 11561371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561317) 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, 251312 + ... + 251357.

It is an arithmetic number, because the mean of its divisors is an integer number (3016020).

Almost surely, 2^11561387 is an apocalyptic number.

11561387 is a deficient number, since it is larger than the sum of its proper divisors (502693).

11561387 is an equidigital number, since it uses as much as digits as its factorization.

11561387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502692.

The product of its digits is 5040, while the sum is 32.

The square root of 11561387 is about 3400.2039644704. The cubic root of 11561387 is about 226.1187865897.

Adding to 11561387 its reverse (78316511), we get a palindrome (89877898).

The spelling of 11561387 in words is "eleven million, five hundred sixty-one thousand, three hundred eighty-seven".