11991477 has 12 divisors (see below), whose sum is σ = 16985696. Its totient is φ = 7523520.

The previous prime is 11991461. The next prime is 11991481. The reversal of 11991477 is 77419911.

11991477 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11991477 - 2⁴ = 11991461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11991407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6049 + ... + 7782.

Almost surely, 2^11991477 is an apocalyptic number.

11991477 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11991477 is a deficient number, since it is larger than the sum of its proper divisors (4994219).

11991477 is a wasteful number, since it uses less digits than its factorization.

11991477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13868 (or 13851 counting only the distinct ones).

The product of its digits is 15876, while the sum is 39.

The square root of 11991477 is about 3462.8712075386. The cubic root of 11991477 is about 228.8886334538. Note that the first 3 decimals are identical.

The spelling of 11991477 in words is "eleven million, nine hundred ninety-one thousand, four hundred seventy-seven".