55120013 has 8 divisors (see below), whose sum is σ = 59535000. Its totient is φ = 50730048.

The previous prime is 55120003. The next prime is 55120061. The reversal of 55120013 is 31002155.

It can be written as a sum of positive squares in 4 ways, for example, as 20097289 + 35022724 = 4483^2 + 5918^2 .

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 55120013 - 2⁴ = 55119997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55119973 and 55120000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55120003) 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, 1538 + ... + 10611.

It is an arithmetic number, because the mean of its divisors is an integer number (7441875).

Almost surely, 2^55120013 is an apocalyptic number.

It is an amenable number.

55120013 is a deficient number, since it is larger than the sum of its proper divisors (4414987).

55120013 is a wasteful number, since it uses less digits than its factorization.

55120013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12511.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 55120013 is about 7424.2853528134. The cubic root of 55120013 is about 380.5716534516.

Adding to 55120013 its reverse (31002155), we get a palindrome (86122168).

The spelling of 55120013 in words is "fifty-five million, one hundred twenty thousand, thirteen".