54505991 has 4 divisors (see below), whose sum is σ = 54561984. Its totient is φ = 54450000.

The previous prime is 54505981. The next prime is 54505999. The reversal of 54505991 is 19950545.

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-54505991 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 (54505999) 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, 26510 + ... + 28491.

It is an arithmetic number, because the mean of its divisors is an integer number (13640496).

Almost surely, 2^54505991 is an apocalyptic number.

54505991 is a deficient number, since it is larger than the sum of its proper divisors (55993).

54505991 is an equidigital number, since it uses as much as digits as its factorization.

54505991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55992.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 54505991 is about 7382.8172806863. The cubic root of 54505991 is about 379.1532183345.

The spelling of 54505991 in words is "fifty-four million, five hundred five thousand, nine hundred ninety-one".