54054909991 has 4 divisors (see below), whose sum is σ = 54116267184. Its totient is φ = 53993552800.

The previous prime is 54054909913. The next prime is 54054910001. The reversal of 54054909991 is 19990945045.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54054909991 is a prime.

It is a super-2 number, since 2×54054909991² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54054909691) 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, 30677275 + ... + 30679036.

It is an arithmetic number, because the mean of its divisors is an integer number (13529066796).

Almost surely, 2^54054909991 is an apocalyptic number.

54054909991 is a deficient number, since it is larger than the sum of its proper divisors (61357193).

54054909991 is an equidigital number, since it uses as much as digits as its factorization.

54054909991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61357192.

The product of its (nonzero) digits is 2624400, while the sum is 55.

The spelling of 54054909991 in words is "fifty-four billion, fifty-four million, nine hundred nine thousand, nine hundred ninety-one".