55309553 has 8 divisors (see below), whose sum is σ = 60832128. Its totient is φ = 49968144.

The previous prime is 55309547. The next prime is 55309571. The reversal of 55309553 is 35590355.

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

It is not a de Polignac number, because 55309553 - 2⁴ = 55309537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55309853) 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, 44651 + ... + 45872.

It is an arithmetic number, because the mean of its divisors is an integer number (7604016).

Almost surely, 2^55309553 is an apocalyptic number.

It is an amenable number.

55309553 is a deficient number, since it is larger than the sum of its proper divisors (5522575).

55309553 is a wasteful number, since it uses less digits than its factorization.

55309553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90583.

The product of its (nonzero) digits is 50625, while the sum is 35.

The square root of 55309553 is about 7437.0392630401. The cubic root of 55309553 is about 381.0073755757.

The spelling of 55309553 in words is "fifty-five million, three hundred nine thousand, five hundred fifty-three".