54328991 has 4 divisors (see below), whose sum is σ = 57524832. Its totient is φ = 51133152.

The previous prime is 54328969. The next prime is 54328993. The reversal of 54328991 is 19982345.

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 54328991 - 2⁶ = 54328927 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 (54328993) 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, 1597895 + ... + 1597928.

It is an arithmetic number, because the mean of its divisors is an integer number (14381208).

Almost surely, 2^54328991 is an apocalyptic number.

54328991 is a deficient number, since it is larger than the sum of its proper divisors (3195841).

54328991 is a wasteful number, since it uses less digits than its factorization.

54328991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195840.

The product of its digits is 77760, while the sum is 41.

The square root of 54328991 is about 7370.8202392949. The cubic root of 54328991 is about 378.7423589464.

The spelling of 54328991 in words is "fifty-four million, three hundred twenty-eight thousand, nine hundred ninety-one".