219491197 has 2 divisors, whose sum is σ = 219491198. Its totient is φ = 219491196.

The previous prime is 219491189. The next prime is 219491201. The reversal of 219491197 is 791194912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142420356 + 77070841 = 11934^2 + 8779^2 .

It is a cyclic number.

It is not a de Polignac number, because 219491197 - 2³ = 219491189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219491897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109745598 + 109745599.

It is an arithmetic number, because the mean of its divisors is an integer number (109745599).

Almost surely, 2^219491197 is an apocalyptic number.

It is an amenable number.

219491197 is a deficient number, since it is larger than the sum of its proper divisors (1).

219491197 is an equidigital number, since it uses as much as digits as its factorization.

219491197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 43.

The square root of 219491197 is about 14815.2353001901. The cubic root of 219491197 is about 603.2153284740.

The spelling of 219491197 in words is "two hundred nineteen million, four hundred ninety-one thousand, one hundred ninety-seven".