83961391 has 2 divisors, whose sum is σ = 83961392. Its totient is φ = 83961390.

The previous prime is 83961379. The next prime is 83961407. The reversal of 83961391 is 19316938.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83961391 - 2¹⁷ = 83830319 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 (83931391) 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, 41980695 + 41980696.

It is an arithmetic number, because the mean of its divisors is an integer number (41980696).

Almost surely, 2^83961391 is an apocalyptic number.

83961391 is a deficient number, since it is larger than the sum of its proper divisors (1).

83961391 is an equidigital number, since it uses as much as digits as its factorization.

83961391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 83961391 is about 9163.0448541956. The cubic root of 83961391 is about 437.8848049542.

The spelling of 83961391 in words is "eighty-three million, nine hundred sixty-one thousand, three hundred ninety-one".