93685721 has 2 divisors, whose sum is σ = 93685722. Its totient is φ = 93685720.

The previous prime is 93685703. The next prime is 93685723. The reversal of 93685721 is 12758639.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74149321 + 19536400 = 8611^2 + 4420^2 .

It is a cyclic number.

It is not a de Polignac number, because 93685721 - 2²⁶ = 26576857 is a prime.

Together with 93685723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (93685723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46842860 + 46842861.

It is an arithmetic number, because the mean of its divisors is an integer number (46842861).

Almost surely, 2^93685721 is an apocalyptic number.

It is an amenable number.

93685721 is a deficient number, since it is larger than the sum of its proper divisors (1).

93685721 is an equidigital number, since it uses as much as digits as its factorization.

93685721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 93685721 is about 9679.1384430640. The cubic root of 93685721 is about 454.1762998527.

The spelling of 93685721 in words is "ninety-three million, six hundred eighty-five thousand, seven hundred twenty-one".