219149947 has 2 divisors, whose sum is σ = 219149948. Its totient is φ = 219149946.

The previous prime is 219149929. The next prime is 219149969. The reversal of 219149947 is 749941912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 219149947 - 2¹¹ = 219147899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 219149897 and 219149906.

It is not a weakly prime, because it can be changed into another prime (219141947) 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, 109574973 + 109574974.

It is an arithmetic number, because the mean of its divisors is an integer number (109574974).

Almost surely, 2^219149947 is an apocalyptic number.

219149947 is a deficient number, since it is larger than the sum of its proper divisors (1).

219149947 is an equidigital number, since it uses as much as digits as its factorization.

219149947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 46.

The square root of 219149947 is about 14803.7139596792. The cubic root of 219149947 is about 602.9025535883.

The spelling of 219149947 in words is "two hundred nineteen million, one hundred forty-nine thousand, nine hundred forty-seven".