83961287 has 2 divisors, whose sum is σ = 83961288. Its totient is φ = 83961286.

The previous prime is 83961277. The next prime is 83961313. The reversal of 83961287 is 78216938.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83961287 - 2⁴ = 83961271 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 (83961217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41980643 + 41980644.

It is an arithmetic number, because the mean of its divisors is an integer number (41980644).

Almost surely, 2^83961287 is an apocalyptic number.

83961287 is a deficient number, since it is larger than the sum of its proper divisors (1).

83961287 is an equidigital number, since it uses as much as digits as its factorization.

83961287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 83961287 is about 9163.0391792243. The cubic root of 83961287 is about 437.8846241566.

It can be divided in two parts, 83961 and 287, that added together give a palindrome (84248).

The spelling of 83961287 in words is "eighty-three million, nine hundred sixty-one thousand, two hundred eighty-seven".