55345009 has 4 divisors (see below), whose sum is σ = 56283120. Its totient is φ = 54406900.

The previous prime is 55344977. The next prime is 55345019. The reversal of 55345009 is 90054355.

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 cyclic number.

It is not a de Polignac number, because 55345009 - 2⁵ = 55344977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55345019) 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, 468967 + ... + 469084.

It is an arithmetic number, because the mean of its divisors is an integer number (14070780).

Almost surely, 2^55345009 is an apocalyptic number.

55345009 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

55345009 is a deficient number, since it is larger than the sum of its proper divisors (938111).

55345009 is an equidigital number, since it uses as much as digits as its factorization.

55345009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938110.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 55345009 is about 7439.4226254461. The cubic root of 55345009 is about 381.0887726772.

The spelling of 55345009 in words is "fifty-five million, three hundred forty-five thousand, nine".