55506013 has 4 divisors (see below), whose sum is σ = 56687040. Its totient is φ = 54324988.

The previous prime is 55505993. The next prime is 55506023. The reversal of 55506013 is 31060555.

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 55506013 - 2¹⁷ = 55374941 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 (55506023) 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, 590443 + ... + 590536.

It is an arithmetic number, because the mean of its divisors is an integer number (14171760).

Almost surely, 2^55506013 is an apocalyptic number.

It is an amenable number.

55506013 is a deficient number, since it is larger than the sum of its proper divisors (1181027).

55506013 is a wasteful number, since it uses less digits than its factorization.

55506013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181026.

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

The square root of 55506013 is about 7450.2357680814. The cubic root of 55506013 is about 381.4579563139.

Adding to 55506013 its reverse (31060555), we get a palindrome (86566568).

The spelling of 55506013 in words is "fifty-five million, five hundred six thousand, thirteen".