942543221 has 2 divisors, whose sum is σ = 942543222. Its totient is φ = 942543220.

The previous prime is 942543193. The next prime is 942543227. The reversal of 942543221 is 122345249.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543542596 + 399000625 = 23314^2 + 19975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-942543221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (942543227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 471271610 + 471271611.

It is an arithmetic number, because the mean of its divisors is an integer number (471271611).

Almost surely, 2^942543221 is an apocalyptic number.

It is an amenable number.

942543221 is a deficient number, since it is larger than the sum of its proper divisors (1).

942543221 is an equidigital number, since it uses as much as digits as its factorization.

942543221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 942543221 is about 30700.8667792947. The cubic root of 942543221 is about 980.4687543000.

The spelling of 942543221 in words is "nine hundred forty-two million, five hundred forty-three thousand, two hundred twenty-one".