55545491 has 4 divisors (see below), whose sum is σ = 56487000. Its totient is φ = 54603984.

The previous prime is 55545467. The next prime is 55545499. The reversal of 55545491 is 19454555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55545491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55545499) 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, 470666 + ... + 470783.

It is an arithmetic number, because the mean of its divisors is an integer number (14121750).

Almost surely, 2^55545491 is an apocalyptic number.

55545491 is a deficient number, since it is larger than the sum of its proper divisors (941509).

55545491 is an equidigital number, since it uses as much as digits as its factorization.

55545491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941508.

The product of its digits is 90000, while the sum is 38.

The square root of 55545491 is about 7452.8847435070. The cubic root of 55545491 is about 381.5483707127.

The spelling of 55545491 in words is "fifty-five million, five hundred forty-five thousand, four hundred ninety-one".