55911881 has 4 divisors (see below), whose sum is σ = 56859600. Its totient is φ = 54964164.

The previous prime is 55911859. The next prime is 55911893. The reversal of 55911881 is 18811955.

It is a happy number.

55911881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 de Polignac number, because none of the positive numbers 2^k-55911881 is a prime.

It is a super-2 number, since 2×55911881² = 6252276873916322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55911841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473771 + ... + 473888.

It is an arithmetic number, because the mean of its divisors is an integer number (14214900).

Almost surely, 2^55911881 is an apocalyptic number.

It is an amenable number.

55911881 is a deficient number, since it is larger than the sum of its proper divisors (947719).

55911881 is an equidigital number, since it uses as much as digits as its factorization.

55911881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947718.

The product of its digits is 14400, while the sum is 38.

The square root of 55911881 is about 7477.4247572276. The cubic root of 55911881 is about 382.3854578927.

The spelling of 55911881 in words is "fifty-five million, nine hundred eleven thousand, eight hundred eighty-one".