55231311 has 8 divisors (see below), whose sum is σ = 73677184. Its totient is φ = 36803160.

The previous prime is 55231301. The next prime is 55231327. The reversal of 55231311 is 11313255.

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

It is not a de Polignac number, because 55231311 - 2¹¹ = 55229263 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 (55231301) 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, 7230 + ... + 12756.

It is an arithmetic number, because the mean of its divisors is an integer number (9209648).

Almost surely, 2^55231311 is an apocalyptic number.

55231311 is a deficient number, since it is larger than the sum of its proper divisors (18445873).

55231311 is a wasteful number, since it uses less digits than its factorization.

55231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861.

The product of its digits is 450, while the sum is 21.

The square root of 55231311 is about 7431.7771091442. Note that the first 3 decimals coincide. The cubic root of 55231311 is about 380.8276305739.

Adding to 55231311 its reverse (11313255), we get a palindrome (66544566).

The spelling of 55231311 in words is "fifty-five million, two hundred thirty-one thousand, three hundred eleven".