83410781 has 2 divisors, whose sum is σ = 83410782. Its totient is φ = 83410780.

The previous prime is 83410771. The next prime is 83410783. The reversal of 83410781 is 18701438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81631225 + 1779556 = 9035^2 + 1334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83410781 is a prime.

It is a super-2 number, since 2×83410781² = 13914716774059922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 83410783, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83410783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41705390 + 41705391.

It is an arithmetic number, because the mean of its divisors is an integer number (41705391).

Almost surely, 2^83410781 is an apocalyptic number.

It is an amenable number.

83410781 is a deficient number, since it is larger than the sum of its proper divisors (1).

83410781 is an equidigital number, since it uses as much as digits as its factorization.

83410781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 83410781 is about 9132.9502900213. The cubic root of 83410781 is about 436.9255040082.

The spelling of 83410781 in words is "eighty-three million, four hundred ten thousand, seven hundred eighty-one".