83687717 has 2 divisors, whose sum is σ = 83687718. Its totient is φ = 83687716.

The previous prime is 83687657. The next prime is 83687741. The reversal of 83687717 is 71778638.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74114881 + 9572836 = 8609^2 + 3094^2 .

It is a cyclic number.

It is not a de Polignac number, because 83687717 - 2²² = 79493413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83687797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41843858 + 41843859.

It is an arithmetic number, because the mean of its divisors is an integer number (41843859).

Almost surely, 2^83687717 is an apocalyptic number.

It is an amenable number.

83687717 is a deficient number, since it is larger than the sum of its proper divisors (1).

83687717 is an equidigital number, since it uses as much as digits as its factorization.

83687717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 47.

The square root of 83687717 is about 9148.0990921612. The cubic root of 83687717 is about 437.4085220440.

The spelling of 83687717 in words is "eighty-three million, six hundred eighty-seven thousand, seven hundred seventeen".