55054991 has 4 divisors (see below), whose sum is σ = 55297752. Its totient is φ = 54812232.

The previous prime is 55054973. The next prime is 55055009. The reversal of 55054991 is 19945055.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (55054973) and next prime (55055009).

It is a cyclic number.

It is not a de Polignac number, because 55054991 - 2¹⁸ = 54792847 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 (55054931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121040 + ... + 121493.

It is an arithmetic number, because the mean of its divisors is an integer number (13824438).

Almost surely, 2^55054991 is an apocalyptic number.

55054991 is a deficient number, since it is larger than the sum of its proper divisors (242761).

55054991 is a wasteful number, since it uses less digits than its factorization.

55054991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242760.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 55054991 is about 7419.9050533009. The cubic root of 55054991 is about 380.4219481970.

The spelling of 55054991 in words is "fifty-five million, fifty-four thousand, nine hundred ninety-one".