55231513 has 4 divisors (see below), whose sum is σ = 55321360. Its totient is φ = 55141668.

The previous prime is 55231489. The next prime is 55231549. The reversal of 55231513 is 31513255.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31513255 = 5 ⋅6302651.

It is a cyclic number.

It is not a de Polignac number, because 55231513 - 2¹³ = 55223321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55231013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43995 + ... + 45232.

It is an arithmetic number, because the mean of its divisors is an integer number (13830340).

Almost surely, 2^55231513 is an apocalyptic number.

It is an amenable number.

55231513 is a deficient number, since it is larger than the sum of its proper divisors (89847).

55231513 is an equidigital number, since it uses as much as digits as its factorization.

55231513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89846.

The product of its digits is 2250, while the sum is 25.

The square root of 55231513 is about 7431.7906994210. The cubic root of 55231513 is about 380.8280948461.

Adding to 55231513 its reverse (31513255), we get a palindrome (86744768).

The spelling of 55231513 in words is "fifty-five million, two hundred thirty-one thousand, five hundred thirteen".