83021531 has 2 divisors, whose sum is σ = 83021532. Its totient is φ = 83021530.

The previous prime is 83021501. The next prime is 83021569. The reversal of 83021531 is 13512038.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83021531 - 2¹⁰ = 83020507 is a prime.

It is a super-2 number, since 2×83021531² = 13785149219167922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 83021497 and 83021506.

It is not a weakly prime, because it can be changed into another prime (83021501) 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, 41510765 + 41510766.

It is an arithmetic number, because the mean of its divisors is an integer number (41510766).

Almost surely, 2^83021531 is an apocalyptic number.

83021531 is a deficient number, since it is larger than the sum of its proper divisors (1).

83021531 is an equidigital number, since it uses as much as digits as its factorization.

83021531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 83021531 is about 9111.6151696612. The cubic root of 83021531 is about 436.2447826570.

Adding to 83021531 its reverse (13512038), we get a palindrome (96533569).

The spelling of 83021531 in words is "eighty-three million, twenty-one thousand, five hundred thirty-one".