83061991 has 4 divisors (see below), whose sum is σ = 83696184. Its totient is φ = 82427800.

The previous prime is 83061917. The next prime is 83062069. The reversal of 83061991 is 19916038.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19916038 = 2 ⋅9958019.

It is a cyclic number.

It is not a de Polignac number, because 83061991 - 2¹³ = 83053799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83061991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83061791) 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 3 ways as a sum of consecutive naturals, for example, 316900 + ... + 317161.

It is an arithmetic number, because the mean of its divisors is an integer number (20924046).

Almost surely, 2^83061991 is an apocalyptic number.

83061991 is a deficient number, since it is larger than the sum of its proper divisors (634193).

83061991 is a wasteful number, since it uses less digits than its factorization.

83061991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634192.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 83061991 is about 9113.8351422439. The cubic root of 83061991 is about 436.3156381615.

The spelling of 83061991 in words is "eighty-three million, sixty-one thousand, nine hundred ninety-one".