52491 has 4 divisors (see below), whose sum is σ = 69992. Its totient is φ = 34992.
The previous prime is 52489. The next prime is 52501. The reversal of 52491 is 19425.
52491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 52491 - 21 = 52489 is a prime.
It is a D-number.
It is a Duffinian number.
52491 is a lucky number.
It is not an unprimeable number, because it can be changed into a prime (52291) 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, 8746 + ... + 8751.
It is an arithmetic number, because the mean of its divisors is an integer number (17498).
252491 is an apocalyptic number.
52491 is a deficient number, since it is larger than the sum of its proper divisors (17501).
52491 is a wasteful number, since it uses less digits than its factorization.
52491 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 17500.
The product of its digits is 360, while the sum is 21.
The square root of 52491 is about 229.1091442959. The cubic root of 52491 is about 37.4422221360.
The spelling of 52491 in words is "fifty-two thousand, four hundred ninety-one".
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