220134991 has 2 divisors, whose sum is σ = 220134992. Its totient is φ = 220134990.

The previous prime is 220134977. The next prime is 220134997. The reversal of 220134991 is 199431022.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220134991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220134997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110067495 + 110067496.

It is an arithmetic number, because the mean of its divisors is an integer number (110067496).

Almost surely, 2^220134991 is an apocalyptic number.

220134991 is a deficient number, since it is larger than the sum of its proper divisors (1).

220134991 is an equidigital number, since it uses as much as digits as its factorization.

220134991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 220134991 is about 14836.9468220386. The cubic root of 220134991 is about 603.8045204220.

The spelling of 220134991 in words is "two hundred twenty million, one hundred thirty-four thousand, nine hundred ninety-one".