54091591 has 4 divisors (see below), whose sum is σ = 54181312. Its totient is φ = 54001872.

The previous prime is 54091571. The next prime is 54091601. The reversal of 54091591 is 19519045.

It is a happy number.

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 54091591 - 2¹¹ = 54089543 is a prime.

It is a super-2 number, since 2×54091591² = 5851800433822562, which 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 (54091511) 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, 43950 + ... + 45163.

It is an arithmetic number, because the mean of its divisors is an integer number (13545328).

Almost surely, 2^54091591 is an apocalyptic number.

54091591 is a deficient number, since it is larger than the sum of its proper divisors (89721).

54091591 is an equidigital number, since it uses as much as digits as its factorization.

54091591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89720.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 54091591 is about 7354.6985662228. The cubic root of 54091591 is about 378.1898932042.

The spelling of 54091591 in words is "fifty-four million, ninety-one thousand, five hundred ninety-one".