55906613 has 4 divisors (see below), whose sum is σ = 63893280. Its totient is φ = 47919948.

The previous prime is 55906597. The next prime is 55906639. The reversal of 55906613 is 31660955.

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 55906613 - 2⁴ = 55906597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55906313) 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, 3993323 + ... + 3993336.

It is an arithmetic number, because the mean of its divisors is an integer number (15973320).

Almost surely, 2^55906613 is an apocalyptic number.

It is an amenable number.

55906613 is a deficient number, since it is larger than the sum of its proper divisors (7986667).

55906613 is an equidigital number, since it uses as much as digits as its factorization.

55906613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7986666.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 55906613 is about 7477.0724886148. The cubic root of 55906613 is about 382.3734481026.

The spelling of 55906613 in words is "fifty-five million, nine hundred six thousand, six hundred thirteen".