55151213 has 16 divisors (see below), whose sum is σ = 63314496. Its totient is φ = 47589120.

The previous prime is 55151209. The next prime is 55151221. The reversal of 55151213 is 31215155.

It is a happy number.

55151213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55151213 - 2² = 55151209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55151203) 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, 35258 + ... + 36788.

It is an arithmetic number, because the mean of its divisors is an integer number (3957156).

Almost surely, 2^55151213 is an apocalyptic number.

It is an amenable number.

55151213 is a deficient number, since it is larger than the sum of its proper divisors (8163283).

55151213 is a wasteful number, since it uses less digits than its factorization.

55151213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724.

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

The square root of 55151213 is about 7426.3862678964. The cubic root of 55151213 is about 380.6434458630.

Adding to 55151213 its reverse (31215155), we get a palindrome (86366368).

The spelling of 55151213 in words is "fifty-five million, one hundred fifty-one thousand, two hundred thirteen".