83987317 has 2 divisors, whose sum is σ = 83987318. Its totient is φ = 83987316.

The previous prime is 83987273. The next prime is 83987347. The reversal of 83987317 is 71378938.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82464561 + 1522756 = 9081^2 + 1234^2 .

It is a cyclic number.

It is not a de Polignac number, because 83987317 - 2²³ = 75598709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83987347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41993658 + 41993659.

It is an arithmetic number, because the mean of its divisors is an integer number (41993659).

Almost surely, 2^83987317 is an apocalyptic number.

It is an amenable number.

83987317 is a deficient number, since it is larger than the sum of its proper divisors (1).

83987317 is an equidigital number, since it uses as much as digits as its factorization.

83987317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 46.

The square root of 83987317 is about 9164.4594494165. The cubic root of 83987317 is about 437.9298710376.

The spelling of 83987317 in words is "eighty-three million, nine hundred eighty-seven thousand, three hundred seventeen".