93217921 has 2 divisors, whose sum is σ = 93217922. Its totient is φ = 93217920.

The previous prime is 93217913. The next prime is 93217931. The reversal of 93217921 is 12971239.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83539600 + 9678321 = 9140^2 + 3111^2 .

It is a cyclic number.

It is not a de Polignac number, because 93217921 - 2³ = 93217913 is a prime.

It is not a weakly prime, because it can be changed into another prime (93217931) 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, 46608960 + 46608961.

It is an arithmetic number, because the mean of its divisors is an integer number (46608961).

Almost surely, 2^93217921 is an apocalyptic number.

It is an amenable number.

93217921 is a deficient number, since it is larger than the sum of its proper divisors (1).

93217921 is an equidigital number, since it uses as much as digits as its factorization.

93217921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 93217921 is about 9654.9428273812. The cubic root of 93217921 is about 453.4190934325.

The spelling of 93217921 in words is "ninety-three million, two hundred seventeen thousand, nine hundred twenty-one".