220432991 has 2 divisors, whose sum is σ = 220432992. Its totient is φ = 220432990.

The previous prime is 220432963. The next prime is 220432997. The reversal of 220432991 is 199234022.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220432991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220432997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110216495 + 110216496.

It is an arithmetic number, because the mean of its divisors is an integer number (110216496).

Almost surely, 2^220432991 is an apocalyptic number.

220432991 is a deficient number, since it is larger than the sum of its proper divisors (1).

220432991 is an equidigital number, since it uses as much as digits as its factorization.

220432991 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 220432991 is about 14846.9859230754. The cubic root of 220432991 is about 604.0768572796.

The spelling of 220432991 in words is "two hundred twenty million, four hundred thirty-two thousand, nine hundred ninety-one".