83238521 has 2 divisors, whose sum is σ = 83238522. Its totient is φ = 83238520.

The previous prime is 83238509. The next prime is 83238559. The reversal of 83238521 is 12583238.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74304400 + 8934121 = 8620^2 + 2989^2 .

It is a cyclic number.

It is not a de Polignac number, because 83238521 - 2²⁶ = 16129657 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (83238821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41619260 + 41619261.

It is an arithmetic number, because the mean of its divisors is an integer number (41619261).

Almost surely, 2^83238521 is an apocalyptic number.

It is an amenable number.

83238521 is a deficient number, since it is larger than the sum of its proper divisors (1).

83238521 is an equidigital number, since it uses as much as digits as its factorization.

83238521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 83238521 is about 9123.5147284366. The cubic root of 83238521 is about 436.6245171004.

The spelling of 83238521 in words is "eighty-three million, two hundred thirty-eight thousand, five hundred twenty-one".