83129981 has 16 divisors (see below), whose sum is σ = 96657408. Its totient is φ = 70738800.

The previous prime is 83129957. The next prime is 83129993. The reversal of 83129981 is 18992138.

It is not a de Polignac number, because 83129981 - 2¹⁰ = 83128957 is a prime.

It is a super-2 number, since 2×83129981² = 13821187482120722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83129911) 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 in 15 ways as a sum of consecutive naturals, for example, 8396 + ... + 15386.

It is an arithmetic number, because the mean of its divisors is an integer number (6041088).

Almost surely, 2^83129981 is an apocalyptic number.

It is an amenable number.

83129981 is a deficient number, since it is larger than the sum of its proper divisors (13527427).

83129981 is a wasteful number, since it uses less digits than its factorization.

83129981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7072.

The product of its digits is 31104, while the sum is 41.

The square root of 83129981 is about 9117.5644225857. The cubic root of 83129981 is about 436.4346537284.

The spelling of 83129981 in words is "eighty-three million, one hundred twenty-nine thousand, nine hundred eighty-one".