55439291 has 4 divisors (see below), whose sum is σ = 56379000. Its totient is φ = 54499584.

The previous prime is 55439249. The next prime is 55439299. The reversal of 55439291 is 19293455.

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

It is a cyclic number.

It is not a de Polignac number, because 55439291 - 2¹⁸ = 55177147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55439299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469766 + ... + 469883.

It is an arithmetic number, because the mean of its divisors is an integer number (14094750).

Almost surely, 2^55439291 is an apocalyptic number.

55439291 is a deficient number, since it is larger than the sum of its proper divisors (939709).

55439291 is an equidigital number, since it uses as much as digits as its factorization.

55439291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939708.

The product of its digits is 48600, while the sum is 38.

The square root of 55439291 is about 7445.7565767355. The cubic root of 55439291 is about 381.3050488996.

The spelling of 55439291 in words is "fifty-five million, four hundred thirty-nine thousand, two hundred ninety-one".