83778173 has 2 divisors, whose sum is σ = 83778174. Its totient is φ = 83778172.

The previous prime is 83778169. The next prime is 83778181. The reversal of 83778173 is 37187738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59552089 + 24226084 = 7717^2 + 4922^2 .

It is a cyclic number.

It is not a de Polignac number, because 83778173 - 2² = 83778169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83772173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41889086 + 41889087.

It is an arithmetic number, because the mean of its divisors is an integer number (41889087).

Almost surely, 2^83778173 is an apocalyptic number.

It is an amenable number.

83778173 is a deficient number, since it is larger than the sum of its proper divisors (1).

83778173 is an equidigital number, since it uses as much as digits as its factorization.

83778173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 44.

The square root of 83778173 is about 9153.0417348551. The cubic root of 83778173 is about 437.5660600112.

The spelling of 83778173 in words is "eighty-three million, seven hundred seventy-eight thousand, one hundred seventy-three".