55122291 has 12 divisors (see below), whose sum is σ = 90995632. Its totient is φ = 31498416.

The previous prime is 55122289. The next prime is 55122293. The reversal of 55122291 is 19222155.

55122291 is a `hidden beast` number, since 551 + 2 + 22 + 91 = 666.

55122291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55122289) and next prime (55122293).

It is not a de Polignac number, because 55122291 - 2¹ = 55122289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55122293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 437416 + ... + 437541.

Almost surely, 2^55122291 is an apocalyptic number.

55122291 is a deficient number, since it is larger than the sum of its proper divisors (35873341).

55122291 is a wasteful number, since it uses less digits than its factorization.

55122291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874970 (or 874967 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 55122291 is about 7424.4387666678. The cubic root of 55122291 is about 380.5768961347.

The spelling of 55122291 in words is "fifty-five million, one hundred twenty-two thousand, two hundred ninety-one".