55515013 has 4 divisors (see below), whose sum is σ = 58780620. Its totient is φ = 52249408.

The previous prime is 55515011. The next prime is 55515023. The reversal of 55515013 is 31051555.

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 23059204 + 32455809 = 4802^2 + 5697^2 .

It is a cyclic number.

It is not a de Polignac number, because 55515013 - 2¹ = 55515011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55515011) 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, 1632778 + ... + 1632811.

It is an arithmetic number, because the mean of its divisors is an integer number (14695155).

Almost surely, 2^55515013 is an apocalyptic number.

It is an amenable number.

55515013 is a deficient number, since it is larger than the sum of its proper divisors (3265607).

55515013 is a wasteful number, since it uses less digits than its factorization.

55515013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265606.

The product of its (nonzero) digits is 1875, while the sum is 25.

The square root of 55515013 is about 7450.8397513300. The cubic root of 55515013 is about 381.4785723150.

Adding to 55515013 its reverse (31051555), we get a palindrome (86566568).

The spelling of 55515013 in words is "fifty-five million, five hundred fifteen thousand, thirteen".