55863813 has 4 divisors (see below), whose sum is σ = 74485088. Its totient is φ = 37242540.

The previous prime is 55863811. The next prime is 55863817. The reversal of 55863813 is 31836855.

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 not a de Polignac number, because 55863813 - 2¹ = 55863811 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 (55863811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9310633 + ... + 9310638.

It is an arithmetic number, because the mean of its divisors is an integer number (18621272).

Almost surely, 2^55863813 is an apocalyptic number.

It is an amenable number.

55863813 is a deficient number, since it is larger than the sum of its proper divisors (18621275).

55863813 is a wasteful number, since it uses less digits than its factorization.

55863813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18621274.

The product of its digits is 86400, while the sum is 39.

The square root of 55863813 is about 7474.2098579047. The cubic root of 55863813 is about 382.2758462819.

The spelling of 55863813 in words is "fifty-five million, eight hundred sixty-three thousand, eight hundred thirteen".