104021531 has 4 divisors (see below), whose sum is σ = 105726864. Its totient is φ = 102316200.

The previous prime is 104021527. The next prime is 104021549. The reversal of 104021531 is 135120401.

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 104021531 - 2² = 104021527 is a prime.

It is a super-2 number, since 2×104021531² = 21640957823167922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (104021431) 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, 852575 + ... + 852696.

It is an arithmetic number, because the mean of its divisors is an integer number (26431716).

Almost surely, 2^104021531 is an apocalyptic number.

104021531 is a deficient number, since it is larger than the sum of its proper divisors (1705333).

104021531 is an equidigital number, since it uses as much as digits as its factorization.

104021531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705332.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 104021531 is about 10199.0946166804. The cubic root of 104021531 is about 470.2993882453.

Adding to 104021531 its reverse (135120401), we get a palindrome (239141932).

The spelling of 104021531 in words is "one hundred four million, twenty-one thousand, five hundred thirty-one".