83156805 has 12 divisors (see below), whose sum is σ = 144138540. Its totient is φ = 44350272.

The previous prime is 83156803. The next prime is 83156807. The reversal of 83156805 is 50865138.

It is an interprime number because it is at equal distance from previous prime (83156803) and next prime (83156807).

It can be written as a sum of positive squares in 2 ways, for example, as 27311076 + 55845729 = 5226^2 + 7473^2 .

It is not a de Polignac number, because 83156805 - 2¹ = 83156803 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 83156805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83156803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 923920 + ... + 924009.

It is an arithmetic number, because the mean of its divisors is an integer number (12011545).

Almost surely, 2^83156805 is an apocalyptic number.

It is an amenable number.

83156805 is a deficient number, since it is larger than the sum of its proper divisors (60981735).

83156805 is a wasteful number, since it uses less digits than its factorization.

83156805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847940 (or 1847937 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 83156805 is about 9119.0353108210. The cubic root of 83156805 is about 436.4815909227.

The spelling of 83156805 in words is "eighty-three million, one hundred fifty-six thousand, eight hundred five".