55122891 has 8 divisors (see below), whose sum is σ = 77820624. Its totient is φ = 34586880.

The previous prime is 55122877. The next prime is 55122913. The reversal of 55122891 is 19822155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55122891 - 2⁶ = 55122827 is a prime.

It is a super-2 number, since 2×55122891² = 6077066224395762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (55122091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540370 + ... + 540471.

It is an arithmetic number, because the mean of its divisors is an integer number (9727578).

Almost surely, 2^55122891 is an apocalyptic number.

55122891 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55122891 is a deficient number, since it is larger than the sum of its proper divisors (22697733).

55122891 is a wasteful number, since it uses less digits than its factorization.

55122891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080861.

The product of its digits is 7200, while the sum is 33.

The square root of 55122891 is about 7424.4791736525. The cubic root of 55122891 is about 380.5782769754.

The spelling of 55122891 in words is "fifty-five million, one hundred twenty-two thousand, eight hundred ninety-one".