11865491 has 4 divisors (see below), whose sum is σ = 12944184. Its totient is φ = 10786800.

The previous prime is 11865487. The next prime is 11865509. The reversal of 11865491 is 19456811.

11865491 is digitally balanced in base 2, 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, and also an emirpimes, since its reverse is a distinct semiprime: 19456811 = 11 ⋅1768801.

It is a cyclic number.

It is not a de Polignac number, because 11865491 - 2² = 11865487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11865421) 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, 539330 + ... + 539351.

It is an arithmetic number, because the mean of its divisors is an integer number (3236046).

Almost surely, 2^11865491 is an apocalyptic number.

11865491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11865491 is a deficient number, since it is larger than the sum of its proper divisors (1078693).

11865491 is a wasteful number, since it uses less digits than its factorization.

11865491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078692.

The product of its digits is 8640, while the sum is 35.

The square root of 11865491 is about 3444.6322009759. The cubic root of 11865491 is about 228.0842191692.

The spelling of 11865491 in words is "eleven million, eight hundred sixty-five thousand, four hundred ninety-one".