220781291 has 2 divisors, whose sum is σ = 220781292. Its totient is φ = 220781290.

The previous prime is 220781279. The next prime is 220781299. The reversal of 220781291 is 192187022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220781291 - 2¹⁰ = 220780267 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220781299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110390645 + 110390646.

It is an arithmetic number, because the mean of its divisors is an integer number (110390646).

Almost surely, 2^220781291 is an apocalyptic number.

220781291 is a deficient number, since it is larger than the sum of its proper divisors (1).

220781291 is an equidigital number, since it uses as much as digits as its factorization.

220781291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 220781291 is about 14858.7109467814. The cubic root of 220781291 is about 604.3948514993.

The spelling of 220781291 in words is "two hundred twenty million, seven hundred eighty-one thousand, two hundred ninety-one".