221198539 has 2 divisors, whose sum is σ = 221198540. Its totient is φ = 221198538.

The previous prime is 221198507. The next prime is 221198581. The reversal of 221198539 is 935891122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221198539 - 2⁵ = 221198507 is a prime.

It is not a weakly prime, because it can be changed into another prime (221198599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110599269 + 110599270.

It is an arithmetic number, because the mean of its divisors is an integer number (110599270).

Almost surely, 2^221198539 is an apocalyptic number.

221198539 is a deficient number, since it is larger than the sum of its proper divisors (1).

221198539 is an equidigital number, since it uses as much as digits as its factorization.

221198539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 221198539 is about 14872.7448374535. The cubic root of 221198539 is about 604.7753545216.

The spelling of 221198539 in words is "two hundred twenty-one million, one hundred ninety-eight thousand, five hundred thirty-nine".