55515313 has 4 divisors (see below), whose sum is σ = 63446080. Its totient is φ = 47584548.

The previous prime is 55515293. The next prime is 55515373. The reversal of 55515313 is 31351555.

55515313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55515313 - 2¹³ = 55507121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55515373) 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 3 ways as a sum of consecutive naturals, for example, 3965373 + ... + 3965386.

It is an arithmetic number, because the mean of its divisors is an integer number (15861520).

Almost surely, 2^55515313 is an apocalyptic number.

It is an amenable number.

55515313 is a deficient number, since it is larger than the sum of its proper divisors (7930767).

55515313 is an equidigital number, since it uses as much as digits as its factorization.

55515313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7930766.

The product of its digits is 5625, while the sum is 28.

The square root of 55515313 is about 7450.8598832618. The cubic root of 55515313 is about 381.4792594766.

Adding to 55515313 its reverse (31351555), we get a palindrome (86866868).

The spelling of 55515313 in words is "fifty-five million, five hundred fifteen thousand, three hundred thirteen".