55479891 has 8 divisors (see below), whose sum is σ = 78324624. Its totient is φ = 34810880.

The previous prime is 55479869. The next prime is 55479911. The reversal of 55479891 is 19897455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55479891 - 2⁵ = 55479859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55479891.

It is not an unprimeable number, because it can be changed into a prime (55479811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543870 + ... + 543971.

It is an arithmetic number, because the mean of its divisors is an integer number (9790578).

Almost surely, 2^55479891 is an apocalyptic number.

55479891 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55479891 is a deficient number, since it is larger than the sum of its proper divisors (22844733).

55479891 is a wasteful number, since it uses less digits than its factorization.

55479891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087861.

The product of its digits is 453600, while the sum is 48.

The square root of 55479891 is about 7448.4824628914. The cubic root of 55479891 is about 381.3981068925.

The spelling of 55479891 in words is "fifty-five million, four hundred seventy-nine thousand, eight hundred ninety-one".