83158561 has 4 divisors (see below), whose sum is σ = 83178900. Its totient is φ = 83138224.

The previous prime is 83158541. The next prime is 83158583. The reversal of 83158561 is 16585138.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36372961 + 46785600 = 6031^2 + 6840^2 .

It is a cyclic number.

It is not a de Polignac number, because 83158561 - 2¹⁵ = 83125793 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 83158561.

It is not an unprimeable number, because it can be changed into a prime (83158531) 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 3 ways as a sum of consecutive naturals, for example, 1666 + ... + 13003.

It is an arithmetic number, because the mean of its divisors is an integer number (20794725).

Almost surely, 2^83158561 is an apocalyptic number.

It is an amenable number.

83158561 is a deficient number, since it is larger than the sum of its proper divisors (20339).

83158561 is a wasteful number, since it uses less digits than its factorization.

83158561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20338.

The product of its digits is 28800, while the sum is 37.

The square root of 83158561 is about 9119.1315924270. The cubic root of 83158561 is about 436.4846632560.

The spelling of 83158561 in words is "eighty-three million, one hundred fifty-eight thousand, five hundred sixty-one".