55109311 has 4 divisors (see below), whose sum is σ = 57505392. Its totient is φ = 52713232.

The previous prime is 55109303. The next prime is 55109339. The reversal of 55109311 is 11390155.

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

It is a cyclic number.

It is not a de Polignac number, because 55109311 - 2³ = 55109303 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 (55109381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1198006 + ... + 1198051.

It is an arithmetic number, because the mean of its divisors is an integer number (14376348).

Almost surely, 2^55109311 is an apocalyptic number.

55109311 is a deficient number, since it is larger than the sum of its proper divisors (2396081).

55109311 is a wasteful number, since it uses less digits than its factorization.

55109311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396080.

The product of its (nonzero) digits is 675, while the sum is 25.

The square root of 55109311 is about 7423.5645750542. The cubic root of 55109311 is about 380.5470214941.

Adding to 55109311 its reverse (11390155), we get a palindrome (66499466).

The spelling of 55109311 in words is "fifty-five million, one hundred nine thousand, three hundred eleven".