11870891 has 4 divisors (see below), whose sum is σ = 11920800. Its totient is φ = 11820984.

The previous prime is 11870869. The next prime is 11870893. The reversal of 11870891 is 19807811.

11870891 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, and also an emirpimes, since its reverse is a distinct semiprime: 19807811 = 1979 ⋅10009.

It is a cyclic number.

It is not a de Polignac number, because 11870891 - 2¹⁰ = 11869867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11870893) 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, 24596 + ... + 25073.

It is an arithmetic number, because the mean of its divisors is an integer number (2980200).

Almost surely, 2^11870891 is an apocalyptic number.

11870891 is a deficient number, since it is larger than the sum of its proper divisors (49909).

11870891 is an equidigital number, since it uses as much as digits as its factorization.

11870891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49908.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 11870891 is about 3445.4159400572. The cubic root of 11870891 is about 228.1188143941.

The spelling of 11870891 in words is "eleven million, eight hundred seventy thousand, eight hundred ninety-one".