55211531 has 8 divisors (see below), whose sum is σ = 56407104. Its totient is φ = 54021760.

The previous prime is 55211521. The next prime is 55211537. The reversal of 55211531 is 13511255.

It is a happy number.

55211531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55211531 - 2⁶ = 55211467 is a prime.

It is a super-2 number, since 2×55211531² = 6096626310727922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55211497 and 55211506.

It is not an unprimeable number, because it can be changed into a prime (55211537) 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 7 ways as a sum of consecutive naturals, for example, 21635 + ... + 24051.

It is an arithmetic number, because the mean of its divisors is an integer number (7050888).

Almost surely, 2^55211531 is an apocalyptic number.

55211531 is a deficient number, since it is larger than the sum of its proper divisors (1195573).

55211531 is a wasteful number, since it uses less digits than its factorization.

55211531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901.

The product of its digits is 750, while the sum is 23.

The square root of 55211531 is about 7430.4462180948. The cubic root of 55211531 is about 380.7821631882.

Adding to 55211531 its reverse (13511255), we get a palindrome (68722786).

The spelling of 55211531 in words is "fifty-five million, two hundred eleven thousand, five hundred thirty-one".