83009721 has 16 divisors (see below), whose sum is σ = 112831488. Its totient is φ = 54272400.

The previous prime is 83009699. The next prime is 83009741. The reversal of 83009721 is 12790038.

It is a happy number.

It is not a de Polignac number, because 83009721 - 2¹⁹ = 82485433 is a prime.

It is a super-2 number, since 2×83009721² = 13781227560995682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (83009741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44020 + ... + 45866.

It is an arithmetic number, because the mean of its divisors is an integer number (7051968).

Almost surely, 2^83009721 is an apocalyptic number.

It is an amenable number.

83009721 is a deficient number, since it is larger than the sum of its proper divisors (29821767).

83009721 is a wasteful number, since it uses less digits than its factorization.

83009721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 83009721 is about 9110.9670727097. The cubic root of 83009721 is about 436.2240960747.

Adding to 83009721 its reverse (12790038), we get a palindrome (95799759).

The spelling of 83009721 in words is "eighty-three million, nine thousand, seven hundred twenty-one".