55111231331 has 4 divisors (see below), whose sum is σ = 59350556832. Its totient is φ = 50871905832.

The previous prime is 55111231199. The next prime is 55111231369. The reversal of 55111231331 is 13313211155.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13313211155 = 5 ⋅2662642231.

It is a cyclic number.

It is not a de Polignac number, because 55111231331 - 2¹⁴ = 55111214947 is a prime.

It is a super-2 number, since 2×55111231331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55111231331.

It is not an unprimeable number, because it can be changed into a prime (55111230331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2119662731 + ... + 2119662756.

It is an arithmetic number, because the mean of its divisors is an integer number (14837639208).

Almost surely, 2^55111231331 is an apocalyptic number.

55111231331 is a deficient number, since it is larger than the sum of its proper divisors (4239325501).

55111231331 is a wasteful number, since it uses less digits than its factorization.

55111231331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4239325500.

The product of its digits is 1350, while the sum is 26.

Adding to 55111231331 its reverse (13313211155), we get a palindrome (68424442486).

The spelling of 55111231331 in words is "fifty-five billion, one hundred eleven million, two hundred thirty-one thousand, three hundred thirty-one".