220170491 has 2 divisors, whose sum is σ = 220170492. Its totient is φ = 220170490.

The previous prime is 220170481. The next prime is 220170493. The reversal of 220170491 is 194071022.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220170491 is a prime.

It is a Sophie Germain prime.

Together with 220170493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220170491.

It is not a weakly prime, because it can be changed into another prime (220170493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110085245 + 110085246.

It is an arithmetic number, because the mean of its divisors is an integer number (110085246).

Almost surely, 2^220170491 is an apocalyptic number.

220170491 is a deficient number, since it is larger than the sum of its proper divisors (1).

220170491 is an equidigital number, since it uses as much as digits as its factorization.

220170491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 220170491 is about 14838.1431115891. The cubic root of 220170491 is about 603.8369761260.

The spelling of 220170491 in words is "two hundred twenty million, one hundred seventy thousand, four hundred ninety-one".