55318649 has 4 divisors (see below), whose sum is σ = 55361664. Its totient is φ = 55275636.

The previous prime is 55318639. The next prime is 55318661. The reversal of 55318649 is 94681355.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94681355 = 5 ⋅18936271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55318649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55318619) 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, 19517 + ... + 22170.

It is an arithmetic number, because the mean of its divisors is an integer number (13840416).

Almost surely, 2^55318649 is an apocalyptic number.

It is an amenable number.

55318649 is a deficient number, since it is larger than the sum of its proper divisors (43015).

55318649 is a wasteful number, since it uses less digits than its factorization.

55318649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43014.

The product of its digits is 129600, while the sum is 41.

The square root of 55318649 is about 7437.6507715810. The cubic root of 55318649 is about 381.0282607750.

The spelling of 55318649 in words is "fifty-five million, three hundred eighteen thousand, six hundred forty-nine".