55111513 has 4 divisors (see below), whose sum is σ = 57011940. Its totient is φ = 53211088.

The previous prime is 55111493. The next prime is 55111517. The reversal of 55111513 is 31511155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39087504 + 16024009 = 6252^2 + 4003^2 .

It is a cyclic number.

It is not a de Polignac number, because 55111513 - 2¹⁷ = 54980441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55111517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 950170 + ... + 950227.

It is an arithmetic number, because the mean of its divisors is an integer number (14252985).

Almost surely, 2^55111513 is an apocalyptic number.

It is an amenable number.

55111513 is a deficient number, since it is larger than the sum of its proper divisors (1900427).

55111513 is a wasteful number, since it uses less digits than its factorization.

55111513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900426.

The product of its digits is 375, while the sum is 22.

The square root of 55111513 is about 7423.7128850731. The cubic root of 55111513 is about 380.5520899261.

Adding to 55111513 its reverse (31511155), we get a palindrome (86622668).

The spelling of 55111513 in words is "fifty-five million, one hundred eleven thousand, five hundred thirteen".