55321513 has 4 divisors (see below), whose sum is σ = 59577028. Its totient is φ = 51066000.

The previous prime is 55321501. The next prime is 55321529. The reversal of 55321513 is 31512355.

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 7601049 + 47720464 = 2757^2 + 6908^2 .

It is a cyclic number.

It is not a de Polignac number, because 55321513 - 2¹⁷ = 55190441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55321543) 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, 2127738 + ... + 2127763.

It is an arithmetic number, because the mean of its divisors is an integer number (14894257).

Almost surely, 2^55321513 is an apocalyptic number.

It is an amenable number.

55321513 is a deficient number, since it is larger than the sum of its proper divisors (4255515).

55321513 is a wasteful number, since it uses less digits than its factorization.

55321513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255514.

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

The square root of 55321513 is about 7437.8433030012. The cubic root of 55321513 is about 381.0348362918.

Adding to 55321513 its reverse (31512355), we get a palindrome (86833868).

The spelling of 55321513 in words is "fifty-five million, three hundred twenty-one thousand, five hundred thirteen".