219009997 has 8 divisors (see below), whose sum is σ = 232030656. Its totient is φ = 206004672.

The previous prime is 219009983. The next prime is 219010007. The reversal of 219009997 is 799900912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219009997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219009977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39978 + ... + 45124.

It is an arithmetic number, because the mean of its divisors is an integer number (29003832).

Almost surely, 2^219009997 is an apocalyptic number.

It is an amenable number.

219009997 is a deficient number, since it is larger than the sum of its proper divisors (13020659).

219009997 is a wasteful number, since it uses less digits than its factorization.

219009997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7667.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 219009997 is about 14798.9863504228. The cubic root of 219009997 is about 602.7741876286.

The spelling of 219009997 in words is "two hundred nineteen million, nine thousand, nine hundred ninety-seven".