219487997 has 2 divisors, whose sum is σ = 219487998. Its totient is φ = 219487996.

The previous prime is 219487963. The next prime is 219488053. The reversal of 219487997 is 799784912.

It is an a-pointer prime, because the next prime (219488053) can be obtained adding 219487997 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218418841 + 1069156 = 14779^2 + 1034^2 .

It is a cyclic number.

It is not a de Polignac number, because 219487997 - 2²⁰ = 218439421 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 (219487937) 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, 109743998 + 109743999.

It is an arithmetic number, because the mean of its divisors is an integer number (109743999).

Almost surely, 2^219487997 is an apocalyptic number.

It is an amenable number.

219487997 is a deficient number, since it is larger than the sum of its proper divisors (1).

219487997 is an equidigital number, since it uses as much as digits as its factorization.

219487997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 56.

The square root of 219487997 is about 14815.1273028618. The cubic root of 219487997 is about 603.2123969996.

The spelling of 219487997 in words is "two hundred nineteen million, four hundred eighty-seven thousand, nine hundred ninety-seven".