55211331 has 16 divisors (see below), whose sum is σ = 87033600. Its totient is φ = 30461088.

The previous prime is 55211309. The next prime is 55211353. The reversal of 55211331 is 13311255.

55211331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55211309) and next prime (55211353).

It is not a de Polignac number, because 55211331 - 2⁹ = 55210819 is a prime.

It is a super-2 number, since 2×55211331² = 6096582141583122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 55211298 and 55211307.

It is not an unprimeable number, because it can be changed into a prime (55211731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44721 + ... + 45938.

It is an arithmetic number, because the mean of its divisors is an integer number (5439600).

Almost surely, 2^55211331 is an apocalyptic number.

55211331 is a deficient number, since it is larger than the sum of its proper divisors (31822269).

55211331 is a wasteful number, since it uses less digits than its factorization.

55211331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90698.

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

The square root of 55211331 is about 7430.4327599407. The cubic root of 55211331 is about 380.7817034019.

Adding to 55211331 its reverse (13311255), we get a palindrome (68522586).

The spelling of 55211331 in words is "fifty-five million, two hundred eleven thousand, three hundred thirty-one".