83128447 has 2 divisors, whose sum is σ = 83128448. Its totient is φ = 83128446.

The previous prime is 83128429. The next prime is 83128489. The reversal of 83128447 is 74482138.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83128447 - 2⁷ = 83128319 is a prime.

It is a super-3 number, since 3×83128447³ (a number of 25 digits) contains 333 as substring.

It is equal to p_4841299 and since 83128447 and 4841299 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83128427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41564223 + 41564224.

It is an arithmetic number, because the mean of its divisors is an integer number (41564224).

Almost surely, 2^83128447 is an apocalyptic number.

83128447 is a deficient number, since it is larger than the sum of its proper divisors (1).

83128447 is an equidigital number, since it uses as much as digits as its factorization.

83128447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 37.

The square root of 83128447 is about 9117.4802988545. The cubic root of 83128447 is about 436.4319691980.

The spelling of 83128447 in words is "eighty-three million, one hundred twenty-eight thousand, four hundred forty-seven".