55311389 has 16 divisors (see below), whose sum is σ = 66189312. Its totient is φ = 45192048.

The previous prime is 55311367. The next prime is 55311391. The reversal of 55311389 is 98311355.

It is a cyclic number.

It is not a de Polignac number, because 55311389 - 2¹² = 55307293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55311349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80642 + ... + 81324.

It is an arithmetic number, because the mean of its divisors is an integer number (4136832).

Almost surely, 2^55311389 is an apocalyptic number.

It is an amenable number.

55311389 is a deficient number, since it is larger than the sum of its proper divisors (10877923).

55311389 is a wasteful number, since it uses less digits than its factorization.

55311389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216.

The product of its digits is 16200, while the sum is 35.

The square root of 55311389 is about 7437.1626982338. The cubic root of 55311389 is about 381.0115913742.

The spelling of 55311389 in words is "fifty-five million, three hundred eleven thousand, three hundred eighty-nine".