83155681 has 4 divisors (see below), whose sum is σ = 95035072. Its totient is φ = 71276292.

The previous prime is 83155607. The next prime is 83155717. The reversal of 83155681 is 18655138.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83155681 - 2²⁵ = 49601249 is a prime.

It is a super-2 number, since 2×83155681² = 13829734565147522, which contains 22 as substring.

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 83155681.

It is not an unprimeable number, because it can be changed into a prime (83155181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5939685 + ... + 5939698.

It is an arithmetic number, because the mean of its divisors is an integer number (23758768).

Almost surely, 2^83155681 is an apocalyptic number.

It is an amenable number.

83155681 is a deficient number, since it is larger than the sum of its proper divisors (11879391).

83155681 is a wasteful number, since it uses less digits than its factorization.

83155681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11879390.

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

The square root of 83155681 is about 9118.9736812867. The cubic root of 83155681 is about 436.4796243267.

The spelling of 83155681 in words is "eighty-three million, one hundred fifty-five thousand, six hundred eighty-one".