104821531 has 2 divisors, whose sum is σ = 104821532. Its totient is φ = 104821530.

The previous prime is 104821529. The next prime is 104821559. The reversal of 104821531 is 135128401.

It is a weak prime.

It is an emirp because it is prime and its reverse (135128401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 104821531 - 2¹ = 104821529 is a prime.

It is a super-2 number, since 2×104821531² = 21975106722367922, which contains 22 as substring.

Together with 104821529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 104821496 and 104821505.

It is not a weakly prime, because it can be changed into another prime (104821501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52410765 + 52410766.

It is an arithmetic number, because the mean of its divisors is an integer number (52410766).

Almost surely, 2^104821531 is an apocalyptic number.

104821531 is a deficient number, since it is larger than the sum of its proper divisors (1).

104821531 is an equidigital number, since it uses as much as digits as its factorization.

104821531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 104821531 is about 10238.2386668802. The cubic root of 104821531 is about 471.5019568866.

Adding to 104821531 its reverse (135128401), we get a palindrome (239949932).

The spelling of 104821531 in words is "one hundred four million, eight hundred twenty-one thousand, five hundred thirty-one".