221894539 has 2 divisors, whose sum is σ = 221894540. Its totient is φ = 221894538.

The previous prime is 221894509. The next prime is 221894599. The reversal of 221894539 is 935498122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221894539 - 2⁵ = 221894507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221894495 and 221894504.

It is not a weakly prime, because it can be changed into another prime (221894509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110947269 + 110947270.

It is an arithmetic number, because the mean of its divisors is an integer number (110947270).

Almost surely, 2^221894539 is an apocalyptic number.

221894539 is a deficient number, since it is larger than the sum of its proper divisors (1).

221894539 is an equidigital number, since it uses as much as digits as its factorization.

221894539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 221894539 is about 14896.1249659098. The cubic root of 221894539 is about 605.4089978551.

The spelling of 221894539 in words is "two hundred twenty-one million, eight hundred ninety-four thousand, five hundred thirty-nine".