55531111 has 8 divisors (see below), whose sum is σ = 57268224. Its totient is φ = 53817240.

The previous prime is 55531093. The next prime is 55531139. The reversal of 55531111 is 11113555.

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

It is a cyclic number.

It is not a de Polignac number, because 55531111 - 2¹¹ = 55529063 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55531171) 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, 895 + ... + 10576.

It is an arithmetic number, because the mean of its divisors is an integer number (7158528).

Almost surely, 2^55531111 is an apocalyptic number.

55531111 is a deficient number, since it is larger than the sum of its proper divisors (1737113).

55531111 is a wasteful number, since it uses less digits than its factorization.

55531111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11621.

The product of its digits is 375, while the sum is 22.

The square root of 55531111 is about 7451.9199539448. The cubic root of 55531111 is about 381.5154419125.

Adding to 55531111 its reverse (11113555), we get a palindrome (66644666).

The spelling of 55531111 in words is "fifty-five million, five hundred thirty-one thousand, one hundred eleven".