55386613 has 4 divisors (see below), whose sum is σ = 56737548. Its totient is φ = 54035680.

The previous prime is 55386601. The next prime is 55386631. The reversal of 55386613 is 31668355.

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 2490084 + 52896529 = 1578^2 + 7273^2 .

It is a cyclic number.

It is not a de Polignac number, because 55386613 - 2⁹ = 55386101 is a prime.

It is a super-2 number, since 2×55386613² = 6135353799223538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55386673) 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, 675406 + ... + 675487.

It is an arithmetic number, because the mean of its divisors is an integer number (14184387).

Almost surely, 2^55386613 is an apocalyptic number.

It is an amenable number.

55386613 is a deficient number, since it is larger than the sum of its proper divisors (1350935).

55386613 is a wasteful number, since it uses less digits than its factorization.

55386613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350934.

The product of its digits is 64800, while the sum is 37.

The square root of 55386613 is about 7442.2182848933. The cubic root of 55386613 is about 381.1842395582.

The spelling of 55386613 in words is "fifty-five million, three hundred eighty-six thousand, six hundred thirteen".