94639921 has 2 divisors, whose sum is σ = 94639922. Its totient is φ = 94639920.

The previous prime is 94639903. The next prime is 94639933. The reversal of 94639921 is 12993649.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94303521 + 336400 = 9711^2 + 580^2 .

It is an emirp because it is prime and its reverse (12993649) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 94639921 - 2⁷ = 94639793 is a prime.

It is not a weakly prime, because it can be changed into another prime (94633921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47319960 + 47319961.

It is an arithmetic number, because the mean of its divisors is an integer number (47319961).

Almost surely, 2^94639921 is an apocalyptic number.

It is an amenable number.

94639921 is a deficient number, since it is larger than the sum of its proper divisors (1).

94639921 is an equidigital number, since it uses as much as digits as its factorization.

94639921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 43.

The square root of 94639921 is about 9728.3051452964. The cubic root of 94639921 is about 455.7130405103.

The spelling of 94639921 in words is "ninety-four million, six hundred thirty-nine thousand, nine hundred twenty-one".