55491307 has 4 divisors (see below), whose sum is σ = 55812240. Its totient is φ = 55170376.

The previous prime is 55491301. The next prime is 55491311. The reversal of 55491307 is 70319455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70319455 = 5 ⋅14063891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55491307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55491301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160207 + ... + 160552.

It is an arithmetic number, because the mean of its divisors is an integer number (13953060).

Almost surely, 2^55491307 is an apocalyptic number.

55491307 is a deficient number, since it is larger than the sum of its proper divisors (320933).

55491307 is a wasteful number, since it uses less digits than its factorization.

55491307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320932.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 55491307 is about 7449.2487540691. The cubic root of 55491307 is about 381.4242649719.

The spelling of 55491307 in words is "fifty-five million, four hundred ninety-one thousand, three hundred seven".