55110991 has 16 divisors (see below), whose sum is σ = 65016000. Its totient is φ = 46222848.

The previous prime is 55110989. The next prime is 55111003. The reversal of 55110991 is 19901155.

It is a cyclic number.

It is not a de Polignac number, because 55110991 - 2¹ = 55110989 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 (55110961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2110 + ... + 10708.

It is an arithmetic number, because the mean of its divisors is an integer number (4063500).

Almost surely, 2^55110991 is an apocalyptic number.

55110991 is a deficient number, since it is larger than the sum of its proper divisors (9905009).

55110991 is a wasteful number, since it uses less digits than its factorization.

55110991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8658.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 55110991 is about 7423.6777273801. The cubic root of 55110991 is about 380.5508884299.

The spelling of 55110991 in words is "fifty-five million, one hundred ten thousand, nine hundred ninety-one".