55629991 has 8 divisors (see below), whose sum is σ = 56968704. Its totient is φ = 54306840.

The previous prime is 55629971. The next prime is 55629997. The reversal of 55629991 is 19992655.

55629991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 55629991 - 2⁷ = 55629863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55629997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3510 + ... + 11116.

It is an arithmetic number, because the mean of its divisors is an integer number (7121088).

Almost surely, 2^55629991 is an apocalyptic number.

55629991 is a deficient number, since it is larger than the sum of its proper divisors (1338713).

55629991 is a wasteful number, since it uses less digits than its factorization.

55629991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7781.

The product of its digits is 218700, while the sum is 46.

The square root of 55629991 is about 7458.5515349832. The cubic root of 55629991 is about 381.7417527585.

The spelling of 55629991 in words is "fifty-five million, six hundred twenty-nine thousand, nine hundred ninety-one".