55691181 has 48 divisors (see below), whose sum is σ = 100953216. Its totient is φ = 28798848.

The previous prime is 55691177. The next prime is 55691213. The reversal of 55691181 is 18119655.

55691181 is a `hidden beast` number, since 5 + 569 + 11 + 81 = 666.

It is not a de Polignac number, because 55691181 - 2² = 55691177 is a prime.

It is a super-2 number, since 2×55691181² = 6203015282349522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55695181) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42766 + ... + 44048.

It is an arithmetic number, because the mean of its divisors is an integer number (2103192).

Almost surely, 2^55691181 is an apocalyptic number.

It is an amenable number.

55691181 is a deficient number, since it is larger than the sum of its proper divisors (45262035).

55691181 is a wasteful number, since it uses less digits than its factorization.

55691181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362 (or 1359 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 55691181 is about 7462.6524105039. The cubic root of 55691181 is about 381.8816666083.

The spelling of 55691181 in words is "fifty-five million, six hundred ninety-one thousand, one hundred eighty-one".