83061981 has 12 divisors (see below), whose sum is σ = 121144608. Its totient is φ = 54836424.

The previous prime is 83061917. The next prime is 83062069. The reversal of 83061981 is 18916038.

83061981 is a `hidden beast` number, since 8 + 30 + 619 + 8 + 1 = 666.

It is not a de Polignac number, because 83061981 - 2⁶ = 83061917 is a prime.

It is a super-2 number, since 2×83061981² = 13798585375288722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83061281) 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 11 ways as a sum of consecutive naturals, for example, 43875 + ... + 45728.

It is an arithmetic number, because the mean of its divisors is an integer number (10095384).

Almost surely, 2^83061981 is an apocalyptic number.

It is an amenable number.

83061981 is a deficient number, since it is larger than the sum of its proper divisors (38082627).

83061981 is a wasteful number, since it uses less digits than its factorization.

83061981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89712 (or 89709 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 83061981 is about 9113.8345936274. The cubic root of 83061981 is about 436.3156206519.

The spelling of 83061981 in words is "eighty-three million, sixty-one thousand, nine hundred eighty-one".