3220420991 has 2 divisors, whose sum is σ = 3220420992. Its totient is φ = 3220420990.

The previous prime is 3220420981. The next prime is 3220421003. The reversal of 3220420991 is 1990240223.

It is a weak prime.

It is an emirp because it is prime and its reverse (1990240223) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3220420991 - 2²² = 3216226687 is a prime.

It is a super-2 number, since 2×3220420991² = 20742222718546844162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3220420901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610210495 + 1610210496.

It is an arithmetic number, because the mean of its divisors is an integer number (1610210496).

Almost surely, 2^3220420991 is an apocalyptic number.

3220420991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3220420991 is an equidigital number, since it uses as much as digits as its factorization.

3220420991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 3220420991 is about 56748.7532109737. The cubic root of 3220420991 is about 1476.7406039330.

The spelling of 3220420991 in words is "three billion, two hundred twenty million, four hundred twenty thousand, nine hundred ninety-one".