83188421 has 2 divisors, whose sum is σ = 83188422. Its totient is φ = 83188420.

The previous prime is 83188367. The next prime is 83188423. The reversal of 83188421 is 12488138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82264900 + 923521 = 9070^2 + 961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83188421 is a prime.

It is a Sophie Germain prime.

Together with 83188423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83188423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41594210 + 41594211.

It is an arithmetic number, because the mean of its divisors is an integer number (41594211).

Almost surely, 2^83188421 is an apocalyptic number.

It is an amenable number.

83188421 is a deficient number, since it is larger than the sum of its proper divisors (1).

83188421 is an equidigital number, since it uses as much as digits as its factorization.

83188421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 35.

The square root of 83188421 is about 9120.7686627828. The cubic root of 83188421 is about 436.5369003006.

The spelling of 83188421 in words is "eighty-three million, one hundred eighty-eight thousand, four hundred twenty-one".